diff --git a/libc/calls/fcntl-nt.c b/libc/calls/fcntl-nt.c
index a10b585f3e0..77b8331a16b 100644
--- a/libc/calls/fcntl-nt.c
+++ b/libc/calls/fcntl-nt.c
@@ -51,6 +51,7 @@
 #include "libc/sysv/consts/fio.h"
 #include "libc/sysv/consts/o.h"
 #include "libc/sysv/errfuns.h"
+#include "libc/thread/posixthread.internal.h"
 #include "libc/thread/thread.h"
 
 struct FileLock {
@@ -67,7 +68,9 @@ struct FileLocks {
   struct FileLock *free;
 };
 
-static struct FileLocks g_locks;
+static struct FileLocks g_locks = {
+    .mu = PTHREAD_MUTEX_INITIALIZER,
+};
 
 static textwindows struct FileLock *NewFileLock(void) {
   struct FileLock *fl;
@@ -110,7 +113,7 @@ static textwindows bool EqualsFileLock(struct FileLock *fl, int64_t off,
 
 textwindows void sys_fcntl_nt_lock_cleanup(int fd) {
   struct FileLock *fl, *ft, **flp;
-  pthread_mutex_lock(&g_locks.mu);
+  _pthread_mutex_lock(&g_locks.mu);
   for (flp = &g_locks.list, fl = *flp; fl;) {
     if (fl->fd == fd) {
       *flp = fl->next;
@@ -122,7 +125,7 @@ textwindows void sys_fcntl_nt_lock_cleanup(int fd) {
       fl = *flp;
     }
   }
-  pthread_mutex_unlock(&g_locks.mu);
+  _pthread_mutex_unlock(&g_locks.mu);
 }
 
 static textwindows int64_t GetfileSize(int64_t handle) {
@@ -353,9 +356,9 @@ textwindows int sys_fcntl_nt(int fd, int cmd, uintptr_t arg) {
     } else if (cmd == F_SETLK || cmd == F_SETLKW || cmd == F_GETLK) {
       struct Fd *f = g_fds.p + fd;
       if (f->cursor) {
-        pthread_mutex_lock(&g_locks.mu);
+        _pthread_mutex_lock(&g_locks.mu);
         rc = sys_fcntl_nt_lock(f, fd, cmd, arg);
-        pthread_mutex_unlock(&g_locks.mu);
+        _pthread_mutex_unlock(&g_locks.mu);
       } else {
         rc = ebadf();
       }
diff --git a/libc/calls/internal.h b/libc/calls/internal.h
index 3a3c8160c60..80ffd0c58fc 100644
--- a/libc/calls/internal.h
+++ b/libc/calls/internal.h
@@ -34,6 +34,7 @@ int64_t GetConsoleOutputHandle(void);
 void EchoConsoleNt(const char *, size_t, bool);
 int IsWindowsExecutable(int64_t, const char16_t *);
 void InterceptTerminalCommands(const char *, size_t);
+void sys_read_nt_wipe_keystrokes(void);
 
 forceinline bool __isfdopen(int fd) {
   return 0 <= fd && fd < g_fds.n && g_fds.p[fd].kind != kFdEmpty;
diff --git a/libc/calls/read-nt.c b/libc/calls/read-nt.c
index 9ac353a63c6..6a223a63676 100644
--- a/libc/calls/read-nt.c
+++ b/libc/calls/read-nt.c
@@ -136,10 +136,15 @@ struct Keystrokes {
   struct Keystroke pool[512];
 };
 
-static struct Keystrokes __keystroke;
+static struct Keystrokes __keystroke = {
+    .lock = PTHREAD_MUTEX_INITIALIZER,
+};
 
-textwindows void WipeKeystrokes(void) {
+textwindows void sys_read_nt_wipe_keystrokes(void) {
+  pthread_mutex_t lock = __keystroke.lock;
   bzero(&__keystroke, sizeof(__keystroke));
+  __keystroke.lock = lock;
+  _pthread_mutex_wipe_np(&__keystroke.lock);
 }
 
 textwindows static void FreeKeystrokeImpl(struct Dll *key) {
@@ -191,11 +196,11 @@ textwindows static void InitConsole(void) {
 }
 
 textwindows static void LockKeystrokes(void) {
-  pthread_mutex_lock(&__keystroke.lock);
+  _pthread_mutex_lock(&__keystroke.lock);
 }
 
 textwindows static void UnlockKeystrokes(void) {
-  pthread_mutex_unlock(&__keystroke.lock);
+  _pthread_mutex_unlock(&__keystroke.lock);
 }
 
 textwindows int64_t GetConsoleInputHandle(void) {
diff --git a/libc/dlopen/dlopen.c b/libc/dlopen/dlopen.c
index 3f56cff8cc0..57767d7bb1d 100644
--- a/libc/dlopen/dlopen.c
+++ b/libc/dlopen/dlopen.c
@@ -57,6 +57,7 @@
 #include "libc/sysv/consts/prot.h"
 #include "libc/sysv/errfuns.h"
 #include "libc/temp.h"
+#include "libc/thread/posixthread.internal.h"
 #include "libc/thread/thread.h"
 #include "libc/thread/tls.h"
 
@@ -131,6 +132,8 @@ struct {
 
 long __sysv2nt14();
 long foreign_tramp();
+void __dlopen_lock(void);
+void __dlopen_unlock(void);
 
 static _Thread_local char dlerror_buf[128];
 
@@ -435,14 +438,13 @@ static dontinline char *foreign_alloc_block(void) {
 static dontinline void *foreign_alloc(size_t n) {
   void *res;
   static char *block;
-  static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
-  pthread_mutex_lock(&lock);
+  __dlopen_lock();
   if (!block || READ32LE(block) + n > 65536)
     if (!(block = foreign_alloc_block()))
       return 0;
   res = block + READ32LE(block);
   WRITE32LE(block, READ32LE(block) + n);
-  pthread_mutex_unlock(&lock);
+  __dlopen_unlock();
   return res;
 }
 
diff --git a/libc/intrin/cursor.c b/libc/intrin/cursor.c
index e0c686d4f53..b89b1be2773 100644
--- a/libc/intrin/cursor.c
+++ b/libc/intrin/cursor.c
@@ -20,16 +20,13 @@
 #include "libc/intrin/atomic.h"
 #include "libc/intrin/fds.h"
 #include "libc/runtime/runtime.h"
+#include "libc/thread/posixthread.internal.h"
 
 struct Cursor *__cursor_new(void) {
   struct Cursor *c;
   if ((c = _mapanon(sizeof(struct Cursor)))) {
     if ((c->shared = _mapshared(sizeof(struct CursorShared)))) {
-      pthread_mutexattr_t attr;
-      pthread_mutexattr_init(&attr);
-      pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
-      pthread_mutex_init(&c->shared->lock, &attr);
-      pthread_mutexattr_destroy(&attr);
+      c->shared->lock = (pthread_mutex_t)PTHREAD_SHARED_MUTEX_INITIALIZER_NP;
     } else {
       munmap(c, sizeof(struct Cursor));
       c = 0;
@@ -56,9 +53,9 @@ int __cursor_unref(struct Cursor *c) {
 }
 
 void __cursor_lock(struct Cursor *c) {
-  pthread_mutex_lock(&c->shared->lock);
+  _pthread_mutex_lock(&c->shared->lock);
 }
 
 void __cursor_unlock(struct Cursor *c) {
-  pthread_mutex_unlock(&c->shared->lock);
+  _pthread_mutex_unlock(&c->shared->lock);
 }
diff --git a/libc/intrin/cxalock.c b/libc/intrin/cxalock.c
index f7211d7d317..cb5256757ff 100644
--- a/libc/intrin/cxalock.c
+++ b/libc/intrin/cxalock.c
@@ -17,14 +17,15 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/intrin/cxaatexit.h"
+#include "libc/thread/posixthread.internal.h"
 #include "libc/thread/thread.h"
 
 pthread_mutex_t __cxa_lock_obj = PTHREAD_MUTEX_INITIALIZER;
 
 void __cxa_lock(void) {
-  pthread_mutex_lock(&__cxa_lock_obj);
+  _pthread_mutex_lock(&__cxa_lock_obj);
 }
 
 void __cxa_unlock(void) {
-  pthread_mutex_unlock(&__cxa_lock_obj);
+  _pthread_mutex_unlock(&__cxa_lock_obj);
 }
diff --git a/libc/intrin/dlopen.c b/libc/intrin/dlopen.c
new file mode 100644
index 00000000000..7191d0ffb7d
--- /dev/null
+++ b/libc/intrin/dlopen.c
@@ -0,0 +1,30 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8                               :vi │
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2024 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/thread/posixthread.internal.h"
+#include "libc/thread/thread.h"
+
+pthread_mutex_t __dlopen_lock_obj = PTHREAD_MUTEX_INITIALIZER;
+
+void __dlopen_lock(void) {
+  _pthread_mutex_lock(&__dlopen_lock_obj);
+}
+
+void __dlopen_unlock(void) {
+  _pthread_mutex_unlock(&__dlopen_lock_obj);
+}
diff --git a/libc/intrin/fds_lock.c b/libc/intrin/fds_lock.c
index c32367d8544..1e1ddcc3273 100644
--- a/libc/intrin/fds_lock.c
+++ b/libc/intrin/fds_lock.c
@@ -17,12 +17,13 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/state.internal.h"
+#include "libc/thread/posixthread.internal.h"
 #include "libc/thread/thread.h"
 
 void __fds_lock(void) {
-  pthread_mutex_lock(&__fds_lock_obj);
+  _pthread_mutex_lock(&__fds_lock_obj);
 }
 
 void __fds_unlock(void) {
-  pthread_mutex_unlock(&__fds_lock_obj);
+  _pthread_mutex_unlock(&__fds_lock_obj);
 }
diff --git a/libc/intrin/itimer.c b/libc/intrin/itimer.c
index 595fc0a0080..4d18253960b 100644
--- a/libc/intrin/itimer.c
+++ b/libc/intrin/itimer.c
@@ -18,6 +18,7 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/thread/itimer.h"
 #include "libc/str/str.h"
+#include "libc/thread/posixthread.internal.h"
 
 struct IntervalTimer __itimer = {
     .lock = PTHREAD_MUTEX_INITIALIZER,
@@ -25,18 +26,18 @@ struct IntervalTimer __itimer = {
 };
 
 textwindows void __itimer_lock(void) {
-  pthread_mutex_lock(&__itimer.lock);
+  _pthread_mutex_lock(&__itimer.lock);
 }
 
 textwindows void __itimer_unlock(void) {
-  pthread_mutex_unlock(&__itimer.lock);
+  _pthread_mutex_unlock(&__itimer.lock);
 }
 
 textwindows void __itimer_wipe_and_reset(void) {
   // timers aren't inherited by forked subprocesses
   bzero(&__itimer.it, sizeof(__itimer.it));
-  pthread_mutex_wipe_np(&__itimer.lock);
-  pthread_cond_init(&__itimer.cond, 0);
+  _pthread_mutex_wipe_np(&__itimer.lock);
+  bzero(&__itimer.cond, sizeof(__itimer.cond));
   __itimer.thread = 0;
   __itimer.once = 0;
 }
diff --git a/libc/intrin/localtime_lock.c b/libc/intrin/localtime_lock.c
index b8d2868607f..b7064c9a405 100644
--- a/libc/intrin/localtime_lock.c
+++ b/libc/intrin/localtime_lock.c
@@ -16,14 +16,15 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/thread/posixthread.internal.h"
 #include "third_party/tz/lock.h"
 
 pthread_mutex_t __localtime_lock_obj = PTHREAD_MUTEX_INITIALIZER;
 
 void __localtime_lock(void) {
-  pthread_mutex_lock(&__localtime_lock_obj);
+  _pthread_mutex_lock(&__localtime_lock_obj);
 }
 
 void __localtime_unlock(void) {
-  pthread_mutex_unlock(&__localtime_lock_obj);
+  _pthread_mutex_unlock(&__localtime_lock_obj);
 }
diff --git a/libc/intrin/pthread_mutex_lock.c b/libc/intrin/pthread_mutex_lock.c
index 9947bbc5ec1..e3dc8eca7e1 100644
--- a/libc/intrin/pthread_mutex_lock.c
+++ b/libc/intrin/pthread_mutex_lock.c
@@ -30,6 +30,7 @@
 #include "libc/macros.h"
 #include "libc/runtime/internal.h"
 #include "libc/thread/lock.h"
+#include "libc/thread/posixthread.internal.h"
 #include "libc/thread/thread.h"
 #include "libc/thread/tls.h"
 #include "third_party/nsync/mu.h"
@@ -300,7 +301,7 @@ static errno_t pthread_mutex_lock_impl(pthread_mutex_t *mutex,
  * @see pthread_spin_lock()
  * @vforksafe
  */
-errno_t pthread_mutex_lock(pthread_mutex_t *mutex) {
+errno_t _pthread_mutex_lock(pthread_mutex_t *mutex) {
   if (__tls_enabled && !__vforked) {
     errno_t err = pthread_mutex_lock_impl(mutex, false);
     LOCKTRACE("pthread_mutex_lock(%t) → %s", mutex, DescribeErrno(err));
@@ -323,7 +324,7 @@ errno_t pthread_mutex_lock(pthread_mutex_t *mutex) {
  * @raise EDEADLK if `mutex` is `PTHREAD_MUTEX_ERRORCHECK` and the
  *     current thread already holds this mutex
  */
-errno_t pthread_mutex_trylock(pthread_mutex_t *mutex) {
+errno_t _pthread_mutex_trylock(pthread_mutex_t *mutex) {
   if (__tls_enabled && !__vforked) {
     errno_t err = pthread_mutex_lock_impl(mutex, true);
     LOCKTRACE("pthread_mutex_trylock(%t) → %s", mutex, DescribeErrno(err));
@@ -333,3 +334,6 @@ errno_t pthread_mutex_trylock(pthread_mutex_t *mutex) {
     return 0;
   }
 }
+
+__weak_reference(_pthread_mutex_lock, pthread_mutex_lock);
+__weak_reference(_pthread_mutex_trylock, pthread_mutex_trylock);
diff --git a/libc/intrin/pthread_mutex_unlock.c b/libc/intrin/pthread_mutex_unlock.c
index 2a088beba5a..782699ec7b8 100644
--- a/libc/intrin/pthread_mutex_unlock.c
+++ b/libc/intrin/pthread_mutex_unlock.c
@@ -28,6 +28,7 @@
 #include "libc/intrin/weaken.h"
 #include "libc/runtime/internal.h"
 #include "libc/thread/lock.h"
+#include "libc/thread/posixthread.internal.h"
 #include "libc/thread/thread.h"
 #include "third_party/nsync/mu.h"
 
@@ -166,7 +167,7 @@ static errno_t pthread_mutex_unlock_impl(pthread_mutex_t *mutex) {
  * @raises EPERM if mutex ownership isn't acceptable
  * @vforksafe
  */
-errno_t pthread_mutex_unlock(pthread_mutex_t *mutex) {
+errno_t _pthread_mutex_unlock(pthread_mutex_t *mutex) {
   if (__tls_enabled && !__vforked) {
     errno_t err = pthread_mutex_unlock_impl(mutex);
     LOCKTRACE("pthread_mutex_unlock(%t) → %s", mutex, DescribeErrno(err));
@@ -176,3 +177,5 @@ errno_t pthread_mutex_unlock(pthread_mutex_t *mutex) {
     return 0;
   }
 }
+
+__weak_reference(_pthread_mutex_unlock, pthread_mutex_unlock);
diff --git a/libc/intrin/pthread_mutex_wipe_np.c b/libc/intrin/pthread_mutex_wipe_np.c
index 0f0b5cb2608..e49c3512fc2 100644
--- a/libc/intrin/pthread_mutex_wipe_np.c
+++ b/libc/intrin/pthread_mutex_wipe_np.c
@@ -18,12 +18,13 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/str/str.h"
 #include "libc/thread/lock.h"
+#include "libc/thread/posixthread.internal.h"
 #include "libc/thread/thread.h"
 
 /**
  * Unlocks mutex from child process after fork.
  */
-int pthread_mutex_wipe_np(pthread_mutex_t *mutex) {
+int _pthread_mutex_wipe_np(pthread_mutex_t *mutex) {
   void *edges = mutex->_edges;
   uint64_t word = mutex->_word;
   bzero(mutex, sizeof(*mutex));
@@ -31,3 +32,5 @@ int pthread_mutex_wipe_np(pthread_mutex_t *mutex) {
   mutex->_edges = edges;
   return 0;
 }
+
+__weak_reference(_pthread_mutex_wipe_np, pthread_mutex_wipe_np);
diff --git a/libc/intrin/pthreadlock.c b/libc/intrin/pthreadlock.c
index 7db5827603f..085f5bba0ef 100644
--- a/libc/intrin/pthreadlock.c
+++ b/libc/intrin/pthreadlock.c
@@ -22,9 +22,9 @@
 alignas(64) pthread_mutex_t __pthread_lock_obj = PTHREAD_MUTEX_INITIALIZER;
 
 void _pthread_lock(void) {
-  pthread_mutex_lock(&__pthread_lock_obj);
+  _pthread_mutex_lock(&__pthread_lock_obj);
 }
 
 void _pthread_unlock(void) {
-  pthread_mutex_unlock(&__pthread_lock_obj);
+  _pthread_mutex_unlock(&__pthread_lock_obj);
 }
diff --git a/libc/intrin/rand64.c b/libc/intrin/rand64.c
index 97b687a2d32..e0da32f7d92 100644
--- a/libc/intrin/rand64.c
+++ b/libc/intrin/rand64.c
@@ -22,6 +22,7 @@
 #include "libc/runtime/runtime.h"
 #include "libc/str/str.h"
 #include "libc/sysv/consts/auxv.h"
+#include "libc/thread/posixthread.internal.h"
 #include "libc/thread/thread.h"
 #include "libc/thread/tls.h"
 
@@ -42,7 +43,7 @@ pthread_mutex_t __rand64_lock_obj = PTHREAD_MUTEX_INITIALIZER;
 uint64_t _rand64(void) {
   void *p;
   uint128_t s;
-  pthread_mutex_lock(&__rand64_lock_obj);
+  _pthread_mutex_lock(&__rand64_lock_obj);
   if (__pid == _rand64_pid) {
     s = _rand64_pool;  // normal path
   } else {
@@ -63,6 +64,6 @@ uint64_t _rand64(void) {
     _rand64_pid = __pid;
   }
   _rand64_pool = (s *= 15750249268501108917ull);  // lemur64
-  pthread_mutex_unlock(&__rand64_lock_obj);
+  _pthread_mutex_unlock(&__rand64_lock_obj);
   return s >> 64;
 }
diff --git a/libc/intrin/sig.c b/libc/intrin/sig.c
index 56866464f7d..5a77cfe9bc1 100644
--- a/libc/intrin/sig.c
+++ b/libc/intrin/sig.c
@@ -682,7 +682,7 @@ textwindows dontinstrument static uint32_t __sig_worker(void *arg) {
   __maps_track((char *)(((uintptr_t)sp + __pagesize - 1) & -__pagesize) - STKSZ,
                STKSZ);
   for (;;) {
-    pthread_mutex_lock(&__sig_worker_lock);
+    _pthread_mutex_lock(&__sig_worker_lock);
 
     // dequeue all pending signals and fire them off. if there's no
     // thread that can handle them then __sig_generate will requeue
@@ -732,7 +732,7 @@ textwindows dontinstrument static uint32_t __sig_worker(void *arg) {
     }
 
     // wait until next scheduler quantum
-    pthread_mutex_unlock(&__sig_worker_lock);
+    _pthread_mutex_unlock(&__sig_worker_lock);
     Sleep(POLL_INTERVAL_MS);
   }
   return 0;
diff --git a/libc/intrin/stack.c b/libc/intrin/stack.c
index c77e9a8d095..09ee635b5e2 100644
--- a/libc/intrin/stack.c
+++ b/libc/intrin/stack.c
@@ -28,6 +28,7 @@
 #include "libc/runtime/runtime.h"
 #include "libc/sysv/consts/map.h"
 #include "libc/sysv/consts/prot.h"
+#include "libc/thread/posixthread.internal.h"
 #include "libc/thread/thread.h"
 
 /**
@@ -67,15 +68,15 @@ static struct CosmoStacksConfig cosmo_stacks_config = {
 };
 
 void cosmo_stack_lock(void) {
-  pthread_mutex_lock(&cosmo_stacks.lock);
+  _pthread_mutex_lock(&cosmo_stacks.lock);
 }
 
 void cosmo_stack_unlock(void) {
-  pthread_mutex_unlock(&cosmo_stacks.lock);
+  _pthread_mutex_unlock(&cosmo_stacks.lock);
 }
 
 void cosmo_stack_wipe(void) {
-  pthread_mutex_wipe_np(&cosmo_stacks.lock);
+  _pthread_mutex_wipe_np(&cosmo_stacks.lock);
 }
 
 static errno_t cosmo_stack_munmap(void *addr, size_t size) {
diff --git a/libc/intrin/stdio.c b/libc/intrin/stdio.c
index 9a6b75f2c06..f487b08674e 100644
--- a/libc/intrin/stdio.c
+++ b/libc/intrin/stdio.c
@@ -22,6 +22,7 @@
 #include "libc/intrin/weaken.h"
 #include "libc/mem/mem.h"
 #include "libc/stdio/internal.h"
+#include "libc/thread/posixthread.internal.h"
 
 #define STDIO_FILE_USE_AFTER_FREE 1
 #define CORRUPT_STDIO_FILE_OBJECT 1
@@ -31,11 +32,11 @@ struct Stdio __stdio = {
 };
 
 void __stdio_lock(void) {
-  pthread_mutex_lock(&__stdio.lock);
+  _pthread_mutex_lock(&__stdio.lock);
 }
 
 void __stdio_unlock(void) {
-  pthread_mutex_unlock(&__stdio.lock);
+  _pthread_mutex_unlock(&__stdio.lock);
 }
 
 static int refchk(int refs) {
diff --git a/libc/mem/leaks.c b/libc/mem/leaks.c
index c23ff989aab..ec422cb3b6d 100644
--- a/libc/mem/leaks.c
+++ b/libc/mem/leaks.c
@@ -40,12 +40,12 @@ struct Leak {
 static int leak_count;
 static struct Dll *leaks;
 static struct Dll *freaks;
-static pthread_mutex_t lock;
+static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
 
 void __may_leak(void *alloc) {
   if (!alloc)
     return;
-  pthread_mutex_lock(&lock);
+  _pthread_mutex_lock(&lock);
   if (dll_is_empty(freaks)) {
     int g = __gransize;
     struct Leak *p = _mapanon(g);
@@ -59,7 +59,7 @@ void __may_leak(void *alloc) {
   LEAK_CONTAINER(e)->alloc = alloc;
   dll_remove(&freaks, e);
   dll_make_first(&leaks, e);
-  pthread_mutex_unlock(&lock);
+  _pthread_mutex_unlock(&lock);
 }
 
 static void visitor(void *start, void *end, size_t used_bytes, void *arg) {
diff --git a/libc/proc/execve-nt.greg.c b/libc/proc/execve-nt.greg.c
index bd514b4ff27..c099880188a 100644
--- a/libc/proc/execve-nt.greg.c
+++ b/libc/proc/execve-nt.greg.c
@@ -52,7 +52,7 @@ extern pthread_mutex_t __sig_worker_lock;
 
 static void sys_execve_nt_abort(sigset_t sigmask) {
   _pthread_unlock();
-  pthread_mutex_unlock(&__sig_worker_lock);
+  _pthread_mutex_unlock(&__sig_worker_lock);
   __sig_unblock(sigmask);
 }
 
@@ -61,8 +61,8 @@ textwindows int sys_execve_nt(const char *program, char *const argv[],
 
   // execve() needs to be @asyncsignalsafe
   sigset_t sigmask = __sig_block();
-  pthread_mutex_lock(&__sig_worker_lock);  // order matters
-  _pthread_lock();                         // order matters
+  _pthread_mutex_lock(&__sig_worker_lock);  // order matters
+  _pthread_lock();                          // order matters
 
   // new process should be a child of our parent
   int64_t hParentProcess;
diff --git a/libc/proc/fork-nt.c b/libc/proc/fork-nt.c
index f35500c78f1..c42140517eb 100644
--- a/libc/proc/fork-nt.c
+++ b/libc/proc/fork-nt.c
@@ -68,7 +68,6 @@
 #ifdef __x86_64__
 
 extern long __klog_handle;
-void WipeKeystrokes(void);
 __msabi extern typeof(GetCurrentProcessId) *const __imp_GetCurrentProcessId;
 
 static textwindows wontreturn void AbortFork(const char *func, void *addr) {
@@ -466,8 +465,6 @@ textwindows int sys_fork_nt(uint32_t dwCreationFlags) {
     // re-apply code morphing for function tracing
     if (ftrace_stackdigs)
       _weaken(__hook)(_weaken(ftrace_hook), _weaken(GetSymbolTable)());
-    // reset core runtime services
-    WipeKeystrokes();
     // notify pthread join
     atomic_store_explicit(&_pthread_static.ptid, GetCurrentThreadId(),
                           memory_order_release);
diff --git a/libc/proc/fork.c b/libc/proc/fork.c
index a836b0102ff..42c194d27f9 100644
--- a/libc/proc/fork.c
+++ b/libc/proc/fork.c
@@ -17,6 +17,7 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/calls.h"
+#include "libc/calls/internal.h"
 #include "libc/calls/sig.internal.h"
 #include "libc/calls/state.internal.h"
 #include "libc/calls/struct/sigset.internal.h"
@@ -50,11 +51,14 @@
 
 __msabi extern typeof(GetCurrentProcessId) *const __imp_GetCurrentProcessId;
 
-extern pthread_mutex_t __rand64_lock_obj;
-extern pthread_mutex_t __pthread_lock_obj;
 extern pthread_mutex_t __cxa_lock_obj;
+extern pthread_mutex_t __dlopen_lock_obj;
+extern pthread_mutex_t __pthread_lock_obj;
+extern pthread_mutex_t __rand64_lock_obj;
 extern pthread_mutex_t __sig_worker_lock;
 
+void __dlopen_lock(void);
+void __dlopen_unlock(void);
 void nsync_mu_semaphore_sem_fork_child(void);
 
 // first and last and always
@@ -79,7 +83,7 @@ static void fork_prepare_stdio(void) {
     f->forking = 1;
     __stdio_ref(f);
     __stdio_unlock();
-    pthread_mutex_lock(&f->lock);
+    _pthread_mutex_lock(&f->lock);
     __stdio_unref(f);
     goto StartOver;
   }
@@ -89,7 +93,7 @@ static void fork_parent_stdio(void) {
   struct Dll *e;
   for (e = dll_first(__stdio.files); e; e = dll_next(__stdio.files, e)) {
     FILE_CONTAINER(e)->forking = 0;
-    pthread_mutex_unlock(&FILE_CONTAINER(e)->lock);
+    _pthread_mutex_unlock(&FILE_CONTAINER(e)->lock);
   }
   __stdio_unlock();
 }
@@ -97,25 +101,26 @@ static void fork_parent_stdio(void) {
 static void fork_child_stdio(void) {
   struct Dll *e;
   for (e = dll_first(__stdio.files); e; e = dll_next(__stdio.files, e)) {
-    pthread_mutex_wipe_np(&FILE_CONTAINER(e)->lock);
+    _pthread_mutex_wipe_np(&FILE_CONTAINER(e)->lock);
     FILE_CONTAINER(e)->forking = 0;
   }
-  pthread_mutex_wipe_np(&__stdio.lock);
+  _pthread_mutex_wipe_np(&__stdio.lock);
 }
 
 static void fork_prepare(void) {
-  pthread_mutex_lock(&supreme_lock);
+  _pthread_mutex_lock(&supreme_lock);
   if (_weaken(_pthread_onfork_prepare))
     _weaken(_pthread_onfork_prepare)();
   fork_prepare_stdio();
   __localtime_lock();
+  __dlopen_lock();
   __cxa_lock();
   __gdtoa_lock1();
   __gdtoa_lock();
   _pthread_lock();
   dlmalloc_pre_fork();
   __fds_lock();
-  pthread_mutex_lock(&__rand64_lock_obj);
+  _pthread_mutex_lock(&__rand64_lock_obj);
   if (_weaken(cosmo_stack_lock))
     _weaken(cosmo_stack_lock)();
   __maps_lock();
@@ -126,45 +131,48 @@ static void fork_parent(void) {
   __maps_unlock();
   if (_weaken(cosmo_stack_unlock))
     _weaken(cosmo_stack_unlock)();
-  pthread_mutex_unlock(&__rand64_lock_obj);
+  _pthread_mutex_unlock(&__rand64_lock_obj);
   __fds_unlock();
   dlmalloc_post_fork_parent();
   _pthread_unlock();
   __gdtoa_unlock();
   __gdtoa_unlock1();
   __cxa_unlock();
+  __dlopen_unlock();
   __localtime_unlock();
   fork_parent_stdio();
   if (_weaken(_pthread_onfork_parent))
     _weaken(_pthread_onfork_parent)();
-  pthread_mutex_unlock(&supreme_lock);
+  _pthread_mutex_unlock(&supreme_lock);
 }
 
 static void fork_child(void) {
   nsync_mu_semaphore_sem_fork_child();
   if (_weaken(cosmo_stack_wipe))
     _weaken(cosmo_stack_wipe)();
-  pthread_mutex_wipe_np(&__rand64_lock_obj);
-  pthread_mutex_wipe_np(&__fds_lock_obj);
+  _pthread_mutex_wipe_np(&__dlopen_lock_obj);
+  _pthread_mutex_wipe_np(&__rand64_lock_obj);
+  _pthread_mutex_wipe_np(&__fds_lock_obj);
   dlmalloc_post_fork_child();
-  pthread_mutex_wipe_np(&__gdtoa_lock_obj);
-  pthread_mutex_wipe_np(&__gdtoa_lock1_obj);
+  _pthread_mutex_wipe_np(&__gdtoa_lock_obj);
+  _pthread_mutex_wipe_np(&__gdtoa_lock1_obj);
   fork_child_stdio();
-  pthread_mutex_wipe_np(&__pthread_lock_obj);
-  pthread_mutex_wipe_np(&__cxa_lock_obj);
-  pthread_mutex_wipe_np(&__localtime_lock_obj);
+  _pthread_mutex_wipe_np(&__pthread_lock_obj);
+  _pthread_mutex_wipe_np(&__cxa_lock_obj);
+  _pthread_mutex_wipe_np(&__localtime_lock_obj);
   if (IsWindows()) {
     // we don't bother locking the proc/itimer/sig locks above since
     // their state is reset in the forked child. nothing to protect.
+    sys_read_nt_wipe_keystrokes();
     __proc_wipe_and_reset();
     __itimer_wipe_and_reset();
-    pthread_mutex_wipe_np(&__sig_worker_lock);
+    _pthread_mutex_wipe_np(&__sig_worker_lock);
     if (_weaken(__sig_init))
       _weaken(__sig_init)();
   }
   if (_weaken(_pthread_onfork_child))
     _weaken(_pthread_onfork_child)();
-  pthread_mutex_wipe_np(&supreme_lock);
+  _pthread_mutex_wipe_np(&supreme_lock);
 }
 
 int _fork(uint32_t dwCreationFlags) {
diff --git a/libc/proc/proc.c b/libc/proc/proc.c
index 56a5ff0a5ae..325b7645704 100644
--- a/libc/proc/proc.c
+++ b/libc/proc/proc.c
@@ -255,14 +255,14 @@ static textwindows void __proc_setup(void) {
  */
 textwindows void __proc_lock(void) {
   cosmo_once(&__proc.once, __proc_setup);
-  pthread_mutex_lock(&__proc.lock);
+  _pthread_mutex_lock(&__proc.lock);
 }
 
 /**
  * Unlocks process tracker.
  */
 textwindows void __proc_unlock(void) {
-  pthread_mutex_unlock(&__proc.lock);
+  _pthread_mutex_unlock(&__proc.lock);
 }
 
 /**
@@ -273,7 +273,7 @@ textwindows void __proc_wipe_and_reset(void) {
   pthread_mutex_t lock = __proc.lock;
   bzero(&__proc, sizeof(__proc));
   __proc.lock = lock;
-  pthread_mutex_wipe_np(&__proc.lock);
+  _pthread_mutex_wipe_np(&__proc.lock);
 }
 
 /**
diff --git a/libc/stdio/dirstream.c b/libc/stdio/dirstream.c
index ef11b674b42..f77f4e06ce8 100644
--- a/libc/stdio/dirstream.c
+++ b/libc/stdio/dirstream.c
@@ -49,6 +49,7 @@
 #include "libc/sysv/consts/o.h"
 #include "libc/sysv/consts/s.h"
 #include "libc/sysv/errfuns.h"
+#include "libc/thread/posixthread.internal.h"
 #include "libc/thread/thread.h"
 #include "libc/thread/tls.h"
 #include "libc/zip.h"
@@ -134,11 +135,11 @@ struct dirent_netbsd {
 };
 
 static void lockdir(DIR *dir) {
-  pthread_mutex_lock(&dir->lock);
+  _pthread_mutex_lock(&dir->lock);
 }
 
 static void unlockdir(DIR *dir) {
-  pthread_mutex_unlock(&dir->lock);
+  _pthread_mutex_unlock(&dir->lock);
 }
 
 static textwindows dontinline int fdopendir_nt(DIR *res, int fd) {
diff --git a/libc/stdio/flockfile.c b/libc/stdio/flockfile.c
index 61bac167bda..4b16a0778d8 100644
--- a/libc/stdio/flockfile.c
+++ b/libc/stdio/flockfile.c
@@ -18,6 +18,7 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/assert.h"
 #include "libc/stdio/internal.h"
+#include "libc/thread/posixthread.internal.h"
 #include "libc/thread/thread.h"
 
 /**
@@ -25,5 +26,5 @@
  */
 void flockfile(FILE *f) {
   unassert(f != NULL);
-  pthread_mutex_lock(&f->lock);
+  _pthread_mutex_lock(&f->lock);
 }
diff --git a/libc/stdio/funlockfile.c b/libc/stdio/funlockfile.c
index b47f8ab9d72..cfeb7f53491 100644
--- a/libc/stdio/funlockfile.c
+++ b/libc/stdio/funlockfile.c
@@ -18,11 +18,12 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/stdio/internal.h"
 #include "libc/stdio/stdio.h"
+#include "libc/thread/posixthread.internal.h"
 #include "libc/thread/thread.h"
 
 /**
  * Releases lock on stdio object.
  */
 void funlockfile(FILE *f) {
-  pthread_mutex_unlock(&f->lock);
+  _pthread_mutex_unlock(&f->lock);
 }
diff --git a/libc/testlib/testrunner.c b/libc/testlib/testrunner.c
index 27ef2a63959..b8498e1eb7b 100644
--- a/libc/testlib/testrunner.c
+++ b/libc/testlib/testrunner.c
@@ -34,6 +34,7 @@
 #include "libc/str/str.h"
 #include "libc/testlib/aspect.internal.h"
 #include "libc/testlib/testlib.h"
+#include "libc/thread/posixthread.internal.h"
 #include "libc/thread/thread.h"
 #include "libc/x/x.h"
 
@@ -52,7 +53,7 @@ void testlib_finish(void) {
 void testlib_error_enter(const char *file, const char *func) {
   ftrace_enabled(-1);
   strace_enabled(-1);
-  pthread_mutex_lock(&testlib_error_lock);
+  _pthread_mutex_lock(&testlib_error_lock);
   if (!IsWindows())
     sys_getpid(); /* make strace easier to read */
   if (!IsWindows())
@@ -67,7 +68,7 @@ void testlib_error_enter(const char *file, const char *func) {
 void testlib_error_leave(void) {
   strace_enabled(+1);
   ftrace_enabled(+1);
-  pthread_mutex_unlock(&testlib_error_lock);
+  _pthread_mutex_unlock(&testlib_error_lock);
 }
 
 wontreturn void testlib_abort(void) {
diff --git a/libc/thread/itimer.c b/libc/thread/itimer.c
index 5f3ba03af45..6a7cf2b8afe 100644
--- a/libc/thread/itimer.c
+++ b/libc/thread/itimer.c
@@ -34,6 +34,7 @@
 #include "libc/sysv/consts/sig.h"
 #include "libc/sysv/errfuns.h"
 #include "libc/thread/itimer.h"
+#include "libc/thread/posixthread.internal.h"
 #include "libc/thread/thread2.h"
 #include "libc/thread/tls.h"
 #ifdef __x86_64__
@@ -76,7 +77,7 @@ static textwindows dontinstrument uint32_t __itimer_worker(void *arg) {
       __sig_generate(SIGALRM, SI_TIMER);
     __itimer_lock();
     struct timespec deadline = timeval_totimespec(waituntil);
-    pthread_cond_timedwait(&__itimer.cond, &__itimer.lock, &deadline);
+    _pthread_cond_timedwait(&__itimer.cond, &__itimer.lock, &deadline);
     __itimer_unlock();
   }
   return 0;
@@ -108,7 +109,7 @@ textwindows int sys_setitimer_nt(int which, const struct itimerval *neu,
     if (!timeval_iszero(config.it_value))
       config.it_value = timeval_add(config.it_value, timeval_real());
     __itimer.it = config;
-    pthread_cond_signal(&__itimer.cond);
+    _pthread_cond_signal(&__itimer.cond);
   }
   __itimer_unlock();
   ALLOW_SIGNALS;
diff --git a/libc/thread/posixthread.internal.h b/libc/thread/posixthread.internal.h
index fe94dc066de..09f1f9ae5e0 100644
--- a/libc/thread/posixthread.internal.h
+++ b/libc/thread/posixthread.internal.h
@@ -98,6 +98,11 @@ extern _Atomic(unsigned) _pthread_count;
 extern struct PosixThread _pthread_static;
 extern _Atomic(pthread_key_dtor) _pthread_key_dtor[PTHREAD_KEYS_MAX];
 
+int _pthread_cond_signal(pthread_cond_t *) libcesque paramsnonnull();
+int _pthread_mutex_lock(pthread_mutex_t *) libcesque paramsnonnull();
+int _pthread_mutex_trylock(pthread_mutex_t *) libcesque paramsnonnull();
+int _pthread_mutex_unlock(pthread_mutex_t *) libcesque paramsnonnull();
+int _pthread_mutex_wipe_np(pthread_mutex_t *) libcesque paramsnonnull();
 int _pthread_reschedule(struct PosixThread *) libcesque;
 int _pthread_setschedparam_freebsd(int, int, const struct sched_param *);
 int _pthread_tid(struct PosixThread *) libcesque;
@@ -111,6 +116,13 @@ void _pthread_onfork_prepare(void) libcesque;
 void _pthread_unlock(void) libcesque;
 void _pthread_zombify(struct PosixThread *) libcesque;
 
+int _pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *) libcesque
+    paramsnonnull();
+
+int _pthread_cond_timedwait(pthread_cond_t *, pthread_mutex_t *,
+                            const struct timespec *) libcesque
+    paramsnonnull((1, 2));
+
 forceinline pureconst struct PosixThread *_pthread_self(void) {
   return (struct PosixThread *)__get_tls()->tib_pthread;
 }
diff --git a/libc/thread/pthread_atfork.c b/libc/thread/pthread_atfork.c
index c7e32ed2c7c..ec8cc05fc91 100644
--- a/libc/thread/pthread_atfork.c
+++ b/libc/thread/pthread_atfork.c
@@ -63,17 +63,17 @@ static void _pthread_onfork(int i, const char *op) {
 }
 
 void _pthread_onfork_prepare(void) {
-  pthread_mutex_lock(&_atforks.lock);
+  _pthread_mutex_lock(&_atforks.lock);
   _pthread_onfork(0, "prepare");
 }
 
 void _pthread_onfork_parent(void) {
   _pthread_onfork(1, "parent");
-  pthread_mutex_unlock(&_atforks.lock);
+  _pthread_mutex_unlock(&_atforks.lock);
 }
 
 void _pthread_onfork_child(void) {
-  pthread_mutex_wipe_np(&_atforks.lock);
+  _pthread_mutex_wipe_np(&_atforks.lock);
   _pthread_onfork(2, "child");
 }
 
@@ -171,12 +171,12 @@ int pthread_atfork(atfork_f prepare, atfork_f parent, atfork_f child) {
   a->f[0] = prepare;
   a->f[1] = parent;
   a->f[2] = child;
-  pthread_mutex_lock(&_atforks.lock);
+  _pthread_mutex_lock(&_atforks.lock);
   a->p[0] = 0;
   a->p[1] = _atforks.list;
   if (_atforks.list)
     _atforks.list->p[0] = a;
   _atforks.list = a;
-  pthread_mutex_unlock(&_atforks.lock);
+  _pthread_mutex_unlock(&_atforks.lock);
   return 0;
 }
diff --git a/libc/intrin/pthread_cond_init.c b/libc/thread/pthread_cond_init.c
similarity index 100%
rename from libc/intrin/pthread_cond_init.c
rename to libc/thread/pthread_cond_init.c
diff --git a/libc/thread/pthread_cond_signal.c b/libc/thread/pthread_cond_signal.c
index df0de5bb425..fe6244d1ec3 100644
--- a/libc/thread/pthread_cond_signal.c
+++ b/libc/thread/pthread_cond_signal.c
@@ -43,7 +43,7 @@ __static_yoink("nsync_mu_trylock");
  * @see pthread_cond_broadcast
  * @see pthread_cond_wait
  */
-errno_t pthread_cond_signal(pthread_cond_t *cond) {
+errno_t _pthread_cond_signal(pthread_cond_t *cond) {
 
 #if PTHREAD_USE_NSYNC
   // do nothing if pthread_cond_timedwait() hasn't been called yet
@@ -65,3 +65,5 @@ errno_t pthread_cond_signal(pthread_cond_t *cond) {
     cosmo_futex_wake((atomic_int *)&cond->_sequence, 1, cond->_pshared);
   return 0;
 }
+
+__weak_reference(_pthread_cond_signal, pthread_cond_signal);
diff --git a/libc/thread/pthread_cond_timedwait.c b/libc/thread/pthread_cond_timedwait.c
index cc39e5f3fbf..9e4daff39f3 100644
--- a/libc/thread/pthread_cond_timedwait.c
+++ b/libc/thread/pthread_cond_timedwait.c
@@ -49,7 +49,7 @@ static bool can_use_nsync(uint64_t muword) {
 
 static void pthread_cond_leave(void *arg) {
   struct PthreadWait *wait = (struct PthreadWait *)arg;
-  if (pthread_mutex_lock(wait->mutex))
+  if (_pthread_mutex_lock(wait->mutex))
     __builtin_trap();
   atomic_fetch_sub_explicit(&wait->cond->_waiters, 1, memory_order_acq_rel);
 }
@@ -68,7 +68,7 @@ static errno_t pthread_cond_timedwait_impl(pthread_cond_t *cond,
 
   // start waiting on condition variable
   atomic_fetch_add_explicit(&cond->_waiters, 1, memory_order_acq_rel);
-  if (pthread_mutex_unlock(mutex))
+  if (_pthread_mutex_unlock(mutex))
     __builtin_trap();
 
   // wait for sequence change, timeout, or cancelation
@@ -110,8 +110,8 @@ static errno_t pthread_cond_timedwait_impl(pthread_cond_t *cond,
  * @see pthread_cond_signal()
  * @cancelationpoint
  */
-errno_t pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
-                               const struct timespec *abstime) {
+errno_t _pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
+                                const struct timespec *abstime) {
 
   // validate arguments
   struct PosixThread *pt;
@@ -165,3 +165,5 @@ errno_t pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
   END_CANCELATION_POINT;
   return err;
 }
+
+__weak_reference(_pthread_cond_timedwait, pthread_cond_timedwait);
diff --git a/libc/thread/pthread_cond_wait.c b/libc/thread/pthread_cond_wait.c
index df7d42dd194..e6ffd619c8a 100644
--- a/libc/thread/pthread_cond_wait.c
+++ b/libc/thread/pthread_cond_wait.c
@@ -16,6 +16,7 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/thread/posixthread.internal.h"
 #include "libc/thread/thread.h"
 #include "libc/thread/thread2.h"
 
@@ -39,6 +40,8 @@
  * @see pthread_cond_signal
  * @cancelationpoint
  */
-errno_t pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex) {
+errno_t _pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex) {
   return pthread_cond_timedwait(cond, mutex, 0);
 }
+
+__weak_reference(_pthread_cond_wait, pthread_cond_wait);
diff --git a/libc/intrin/pthread_mutex_consistent.c b/libc/thread/pthread_mutex_consistent.c
similarity index 100%
rename from libc/intrin/pthread_mutex_consistent.c
rename to libc/thread/pthread_mutex_consistent.c
diff --git a/libc/intrin/pthread_mutex_destroy.c b/libc/thread/pthread_mutex_destroy.c
similarity index 100%
rename from libc/intrin/pthread_mutex_destroy.c
rename to libc/thread/pthread_mutex_destroy.c
diff --git a/libc/intrin/pthread_mutex_init.c b/libc/thread/pthread_mutex_init.c
similarity index 100%
rename from libc/intrin/pthread_mutex_init.c
rename to libc/thread/pthread_mutex_init.c
diff --git a/libc/intrin/pthread_mutexattr_destroy.c b/libc/thread/pthread_mutexattr_destroy.c
similarity index 100%
rename from libc/intrin/pthread_mutexattr_destroy.c
rename to libc/thread/pthread_mutexattr_destroy.c
diff --git a/libc/intrin/pthread_mutexattr_getpshared.c b/libc/thread/pthread_mutexattr_getpshared.c
similarity index 100%
rename from libc/intrin/pthread_mutexattr_getpshared.c
rename to libc/thread/pthread_mutexattr_getpshared.c
diff --git a/libc/intrin/pthread_mutexattr_gettype.c b/libc/thread/pthread_mutexattr_gettype.c
similarity index 100%
rename from libc/intrin/pthread_mutexattr_gettype.c
rename to libc/thread/pthread_mutexattr_gettype.c
diff --git a/libc/intrin/pthread_mutexattr_init.c b/libc/thread/pthread_mutexattr_init.c
similarity index 100%
rename from libc/intrin/pthread_mutexattr_init.c
rename to libc/thread/pthread_mutexattr_init.c
diff --git a/libc/intrin/pthread_mutexattr_setpshared.c b/libc/thread/pthread_mutexattr_setpshared.c
similarity index 100%
rename from libc/intrin/pthread_mutexattr_setpshared.c
rename to libc/thread/pthread_mutexattr_setpshared.c
diff --git a/libc/intrin/pthread_mutexattr_settype.c b/libc/thread/pthread_mutexattr_settype.c
similarity index 100%
rename from libc/intrin/pthread_mutexattr_settype.c
rename to libc/thread/pthread_mutexattr_settype.c
diff --git a/libc/intrin/pthread_spin_destroy.c b/libc/thread/pthread_spin_destroy.c
similarity index 100%
rename from libc/intrin/pthread_spin_destroy.c
rename to libc/thread/pthread_spin_destroy.c
diff --git a/libc/intrin/pthread_spin_init.c b/libc/thread/pthread_spin_init.c
similarity index 100%
rename from libc/intrin/pthread_spin_init.c
rename to libc/thread/pthread_spin_init.c
diff --git a/libc/intrin/pthread_spin_lock.c b/libc/thread/pthread_spin_lock.c
similarity index 100%
rename from libc/intrin/pthread_spin_lock.c
rename to libc/thread/pthread_spin_lock.c
diff --git a/libc/intrin/pthread_spin_trylock.c b/libc/thread/pthread_spin_trylock.c
similarity index 100%
rename from libc/intrin/pthread_spin_trylock.c
rename to libc/thread/pthread_spin_trylock.c
diff --git a/libc/intrin/pthread_spin_unlock.c b/libc/thread/pthread_spin_unlock.c
similarity index 100%
rename from libc/intrin/pthread_spin_unlock.c
rename to libc/thread/pthread_spin_unlock.c
diff --git a/libc/thread/sem_open.c b/libc/thread/sem_open.c
index 2fda4471785..156bbc868fc 100644
--- a/libc/thread/sem_open.c
+++ b/libc/thread/sem_open.c
@@ -37,6 +37,7 @@
 #include "libc/sysv/consts/o.h"
 #include "libc/sysv/consts/prot.h"
 #include "libc/sysv/errfuns.h"
+#include "libc/thread/posixthread.internal.h"
 #include "libc/thread/semaphore.h"
 #include "libc/thread/thread.h"
 #include "libc/thread/tls.h"
@@ -56,19 +57,18 @@ static struct Semaphores {
 };
 
 static void sem_open_lock(void) {
-  pthread_mutex_lock(&g_semaphores.lock);
+  _pthread_mutex_lock(&g_semaphores.lock);
 }
 
 static void sem_open_unlock(void) {
-  pthread_mutex_unlock(&g_semaphores.lock);
+  _pthread_mutex_unlock(&g_semaphores.lock);
 }
 
 static void sem_open_wipe(void) {
-  pthread_mutex_init(&g_semaphores.lock, 0);
+  _pthread_mutex_wipe_np(&g_semaphores.lock);
 }
 
 static void sem_open_setup(void) {
-  sem_open_wipe();
   pthread_atfork(sem_open_lock, sem_open_unlock, sem_open_wipe);
 }
 
diff --git a/libc/thread/thread.h b/libc/thread/thread.h
index e2827b7d435..15952c2a76b 100644
--- a/libc/thread/thread.h
+++ b/libc/thread/thread.h
@@ -48,6 +48,7 @@ COSMOPOLITAN_C_START_
 
 #define PTHREAD_MUTEX_INITIALIZER               {0, PTHREAD_MUTEX_DEFAULT}
 #define PTHREAD_NORMAL_MUTEX_INITIALIZER_NP     {0, PTHREAD_MUTEX_NORMAL}
+#define PTHREAD_SHARED_MUTEX_INITIALIZER_NP     {0, PTHREAD_PROCESS_SHARED}
 #define PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP  {0, PTHREAD_MUTEX_RECURSIVE}
 #define PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP {0, PTHREAD_MUTEX_ERRORCHECK}
 
diff --git a/test/libc/system/popen_test.c b/test/libc/system/popen_test.c
index fb4e0d1db1b..b0099bdc706 100644
--- a/test/libc/system/popen_test.c
+++ b/test/libc/system/popen_test.c
@@ -38,6 +38,20 @@
 #include "libc/thread/thread.h"
 #include "libc/time.h"
 
+// test ability of user to override pthread mutex api
+int pthread_mutex_lock(pthread_mutex_t *mutex) {
+  abort();
+}
+int pthread_mutex_unlock(pthread_mutex_t *mutex) {
+  abort();
+}
+int pthread_mutex_trylock(pthread_mutex_t *mutex) {
+  abort();
+}
+int pthread_mutex_wipe_np(pthread_mutex_t *mutex) {
+  abort();
+}
+
 FILE *f;
 char buf[32];
 
diff --git a/test/libc/thread/pthread_create_test.c b/test/libc/thread/pthread_create_test.c
index dfaf03e2a3d..92b6c28db8e 100644
--- a/test/libc/thread/pthread_create_test.c
+++ b/test/libc/thread/pthread_create_test.c
@@ -51,6 +51,20 @@
 #include "libc/thread/thread.h"
 #include "libc/thread/thread2.h"
 
+// test ability of user to override pthread mutex api
+int pthread_mutex_lock(pthread_mutex_t *mutex) {
+  abort();
+}
+int pthread_mutex_unlock(pthread_mutex_t *mutex) {
+  abort();
+}
+int pthread_mutex_trylock(pthread_mutex_t *mutex) {
+  abort();
+}
+int pthread_mutex_wipe_np(pthread_mutex_t *mutex) {
+  abort();
+}
+
 void OnUsr1(int sig, siginfo_t *si, void *vctx) {
 }
 
diff --git a/test/libc/intrin/pthread_spin_lock_test.c b/test/libc/thread/pthread_spin_lock_test.c
similarity index 100%
rename from test/libc/intrin/pthread_spin_lock_test.c
rename to test/libc/thread/pthread_spin_lock_test.c
diff --git a/third_party/gdtoa/lock.c b/third_party/gdtoa/lock.c
index 85b0f5c8a66..e30dcb7c796 100644
--- a/third_party/gdtoa/lock.c
+++ b/third_party/gdtoa/lock.c
@@ -29,6 +29,7 @@
 │  THIS SOFTWARE.                                                              │
 │                                                                              │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/thread/posixthread.internal.h"
 #include "third_party/gdtoa/lock.h"
 
 pthread_mutex_t __gdtoa_lock_obj = PTHREAD_MUTEX_INITIALIZER;
@@ -37,23 +38,23 @@ pthread_mutex_t __gdtoa_lock1_obj = PTHREAD_MUTEX_INITIALIZER;
 void
 __gdtoa_lock(void)
 {
-	pthread_mutex_lock(&__gdtoa_lock_obj);
+	_pthread_mutex_lock(&__gdtoa_lock_obj);
 }
 
 void
 __gdtoa_unlock(void)
 {
-	pthread_mutex_unlock(&__gdtoa_lock_obj);
+	_pthread_mutex_unlock(&__gdtoa_lock_obj);
 }
 
 void
 __gdtoa_lock1(void)
 {
-	pthread_mutex_lock(&__gdtoa_lock1_obj);
+	_pthread_mutex_lock(&__gdtoa_lock1_obj);
 }
 
 void
 __gdtoa_unlock1(void)
 {
-	pthread_mutex_unlock(&__gdtoa_lock1_obj);
+	_pthread_mutex_unlock(&__gdtoa_lock1_obj);
 }