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pthread.c
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pthread.c
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// pthread.h - Simple pthreads
//
// Standalone Win32 implementation of the POSIX pthreads API.
// No disclaimer or attribution is required to use this library.
// This is free and unencumbered software released into the public domain.
//
// Anyone is free to copy, modify, publish, use, compile, sell, or
// distribute this software, either in source code form or as a compiled
// binary, for any purpose, commercial or non-commercial, and by any
// means.
//
// In jurisdictions that recognize copyright laws, the author or authors
// of this software dedicate any and all copyright interest in the
// software to the public domain. We make this dedication for the benefit
// of the public at large and to the detriment of our heirs and
// successors. We intend this dedication to be an overt act of
// relinquishment in perpetuity of all present and future rights to this
// software under copyright law.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
//
// For more information, please refer to <http://unlicense.org/>
#define WINVER 0x600
#define _WIN32_WINNT 0x0600
#include "pthread.h"
#include "semaphore.h"
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <process.h>
#include <limits.h>
#include <errno.h>
#define cassert(X) typedef int __compile_time_assert__[(X)?1:-1]
#define UNUSED(X) (void)(X)
typedef struct pthread_cancel_t
{
void (*fn)(void *arg);
void *arg;
struct pthread_cancel_t *next;
} pthread_cancel_t;
struct pthread_info_t
{
HANDLE hThread;
void *arg;
void *result;
void *(*start)(void *);
pthread_cancel_t *cleanup;
LONG refcount;
int flags;
};
struct pthread_spinlockdata_t
{
CRITICAL_SECTION crit;
};
struct pthread_mutexdata_t
{
CRITICAL_SECTION crit;
};
struct pthread_conddata_t
{
CONDITION_VARIABLE cond;
};
struct pthread_barrierdata_t
{
unsigned count;
LONG numWaiting;
HANDLE hSema;
};
struct pthread_rwlockdata_t
{
SRWLOCK lock;
int exclusive;
};
struct sem_data_t
{
HANDLE hSema;
};
typedef struct {
DWORD slot;
void (*fn)(void *value);
} pthread_key_destructor_t;
static pthread_once_t thread_setup_once = PTHREAD_ONCE_INIT;
static DWORD thread_setup_tls = TLS_OUT_OF_INDEXES;
static int pthread_concurrency = 0;
static unsigned key_count = 0;
static pthread_mutex_t key_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_key_destructor_t key_destructors[PTHREAD_KEYS_MAX];
static void *allocmem(size_t size)
{
return HeapAlloc(GetProcessHeap(), 0, size);
}
static void freemem(void *ptr)
{
HeapFree(GetProcessHeap(), 0, ptr);
}
static void pthread_unref(pthread_t thread)
{
LONG count = InterlockedDecrement(&thread->refcount);
if (count == 0)
{
CloseHandle(thread->hThread);
freemem(thread);
}
}
static void pthread_docleanup(void *value_ptr)
{
unsigned it, n, any;
pthread_key_destructor_t *d;
pthread_t thread = pthread_self();
thread->result = value_ptr;
// Run the cancellation handlers.
while (thread->cleanup)
pthread_cleanup_pop(1);
// Run the key destructors.
pthread_mutex_lock(&key_mutex);
for (it=0;it<PTHREAD_DESTRUCTOR_ITERATIONS;it++)
{
any = 0;
for (n=0;n<key_count;n++)
{
d = &key_destructors[n];
if (d->fn)
{
void *value = pthread_getspecific(d->slot);
if (value)
{
any = 1;
pthread_setspecific(d->slot, NULL);
d->fn(value);
}
}
}
if (!any)
break;
}
pthread_mutex_unlock(&key_mutex);
pthread_unref(thread);
}
static unsigned __stdcall pthread_main(void *arg)
{
void *result;
pthread_t thread = (pthread_t)arg;
InterlockedIncrement(&thread->refcount);
TlsSetValue(thread_setup_tls, thread);
result = thread->start(thread->arg);
pthread_docleanup(result);
return 0;
}
static void thread_setup(void)
{
thread_setup_tls = TlsAlloc();
}
static int pthread_cond_ondemand(pthread_cond_t *cond)
{
pthread_cond_t tmp;
int err;
void *old;
err = pthread_cond_init(&tmp, NULL);
if (err)
return err;
// The old switcheroo. If someone else beat us, simply drop our copy and use theirs.
old = InterlockedCompareExchangePointer((void **)&cond->data, tmp.data, NULL);
if (old != NULL)
pthread_cond_destroy(&tmp);
return 0;
}
static int pthread_mutex_ondemand(pthread_mutex_t *mutex)
{
pthread_mutex_t tmp;
int err;
void *old;
err = pthread_mutex_init(&tmp, NULL);
if (err)
return err;
// The old switcheroo. If someone else beat us, simply drop our copy and use theirs.
old = InterlockedCompareExchangePointer((void **)&mutex->data, tmp.data, NULL);
if (old != NULL)
pthread_mutex_destroy(&tmp);
return 0;
}
void *pthread_gethandle(pthread_t thread)
{
return thread->hThread;
}
int sched_get_priority_max(int policy)
{
UNUSED(policy);
return THREAD_PRIORITY_TIME_CRITICAL;
}
int sched_get_priority_min(int policy)
{
UNUSED(policy);
return THREAD_PRIORITY_LOWEST;
}
int pthread_atfork(void (*prepare)(void), void (*parent)(void), void(*child)(void))
{
// Windows doesn't have fork, nothing we can do here.
UNUSED(prepare); UNUSED(parent); UNUSED(child);
return EINVAL;
}
static int pthread_setattr(pthread_attr_t *attr, int mask, int flags)
{
if (!attr)
return EINVAL;
attr->flags = (attr->flags & ~mask) | (flags & mask);
return 0;
}
static int pthread_getattr(const pthread_attr_t *attr, int mask, int *out)
{
if (!attr || !out)
return EINVAL;
*out = attr->flags & mask;
return 0;
}
int pthread_attr_destroy(pthread_attr_t *attr)
{
// Nothing to do here.
UNUSED(attr);
return 0;
}
int pthread_attr_getdetachstate(const pthread_attr_t *attr, int *detachstate)
{
return pthread_getattr(attr, PTHREAD_CREATE_JOINABLE, detachstate);
}
int pthread_attr_getguardsize(const pthread_attr_t *attr, size_t *guardsize)
{
// Not supported on Windows.
UNUSED(attr); UNUSED(guardsize);
return EINVAL;
}
int pthread_attr_getinheritsched(const pthread_attr_t *attr, int *inheritsched)
{
return pthread_getattr(attr, PTHREAD_INHERIT_SCHED, inheritsched);
}
int pthread_attr_getschedparam(const pthread_attr_t *attr, struct sched_param *param)
{
// Not supported on Windows.
UNUSED(attr); UNUSED(param);
return EINVAL;
}
int pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy)
{
// Not supported on Windows.
UNUSED(attr); UNUSED(policy);
return EINVAL;
}
int pthread_attr_getscope(const pthread_attr_t *attr, int *contentionscope)
{
// Not supported on Windows.
UNUSED(attr); UNUSED(contentionscope);
return EINVAL;
}
int pthread_attr_getstack(const pthread_attr_t *attr, void **stackaddr, size_t *stacksize)
{
// Not supported on Windows.
UNUSED(attr); UNUSED(stackaddr); UNUSED(stacksize);
return EINVAL;
}
int pthread_attr_getstackaddr(const pthread_attr_t *attr, void **stackaddr)
{
// Not supported on Windows.
UNUSED(attr); UNUSED(stackaddr);
return EINVAL;
}
int pthread_attr_getstacksize(const pthread_attr_t *attr, size_t *stacksize)
{
if (!attr || !stacksize)
return EINVAL;
*stacksize = attr->stack;
return 0;
}
int pthread_attr_init(pthread_attr_t *attr)
{
if (!attr)
return EINVAL;
attr->stack = 0;
attr->prio = 0;
attr->flags = PTHREAD_CREATE_JOINABLE | PTHREAD_CANCEL_ENABLE;
return 0;
}
int pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate)
{
return pthread_setattr(attr, PTHREAD_CREATE_JOINABLE, detachstate);
}
int pthread_attr_setguardsize(pthread_attr_t *attr, size_t guardsize)
{
// Not supported on Windows, you have to take whatever guard the OS gives you.
UNUSED(attr); UNUSED(guardsize);
return EINVAL;
}
int pthread_attr_setinheritsched(pthread_attr_t *attr, int inheritsched)
{
return pthread_setattr(attr, PTHREAD_INHERIT_SCHED, inheritsched);
}
int pthread_attr_setschedparam(pthread_attr_t *attr, const struct sched_param *param)
{
if (!attr || !param)
return EINVAL;
attr->prio = param->sched_priority;
return 0;
}
int pthread_attr_setschedpolicy(pthread_attr_t *attr, int param)
{
// Not supported, silently ignore.
UNUSED(attr); UNUSED(param);
return 0;
}
int pthread_attr_setscope(pthread_attr_t *attr, int contentionscope)
{
// Not supported, silently ignore.
UNUSED(attr); UNUSED(contentionscope);
return 0;
}
int pthread_attr_setstack(pthread_attr_t *attr, void *stackaddr, size_t stacksize)
{
// User stacks are not supported on Windows.
UNUSED(attr); UNUSED(stackaddr); UNUSED(stacksize);
return EINVAL;
}
int pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr)
{
// User stacks are not supported on Windows.
UNUSED(attr); UNUSED(stackaddr);
return EINVAL;
}
int pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize)
{
if (!attr)
return EINVAL;
attr->stack = stacksize;
return 0;
}
int pthread_barrier_destroy(pthread_barrier_t *barrier)
{
if (!barrier || !barrier->data)
return EINVAL;
CloseHandle(barrier->data->hSema);
freemem(barrier->data);
return 0;
}
int pthread_barrier_init(pthread_barrier_t *barrier, const pthread_barrierattr_t *attr, unsigned count)
{
if (!barrier || count == 0)
return EINVAL;
UNUSED(attr); // we don't support any of the attributes.
barrier->data = (struct pthread_barrierdata_t *)allocmem(sizeof(struct pthread_barrierdata_t));
if (barrier->data == NULL)
return EAGAIN;
// Windows 8 has a built-in barrier primitive. But I want this to work on Vista, so
// I'll use a semaphore and counter to create the equivalent.
barrier->data->count = count;
barrier->data->numWaiting = 0;
barrier->data->hSema = CreateSemaphoreW(NULL, 0, count, NULL);
if (barrier->data->hSema == NULL)
{
freemem(barrier->data);
return EAGAIN;
}
return 0;
}
int pthread_barrier_wait(pthread_barrier_t *barrier)
{
DWORD err;
LONG result;
if (!barrier || !barrier->data)
return EINVAL;
// Indicate that we are waiting.
result = InterlockedIncrement(&barrier->data->numWaiting);
if ((unsigned)result == barrier->data->count)
{
// We are the last thread to reach the barrier.
// Everyone is now at the barrier, release them all.
InterlockedExchange(&barrier->data->numWaiting, 0);
if (!ReleaseSemaphore(barrier->data->hSema, result-1, NULL))
return EIO;
return PTHREAD_BARRIER_SERIAL_THREAD;
} else {
// Not all threads are at the barrier, so wait.
err = WaitForSingleObject(barrier->data->hSema, INFINITE);
if (err != WAIT_OBJECT_0)
return EIO;
return 0;
}
}
static int pthread_setbarrierattr(pthread_barrierattr_t *attr, int mask, int flags)
{
if (!attr)
return EINVAL;
attr->flags = (attr->flags & ~mask) | (flags & mask);
return 0;
}
static int pthread_getbarrierattr(const pthread_barrierattr_t *attr, int mask, int *out)
{
if (!attr || !out)
return EINVAL;
*out = attr->flags & mask;
return 0;
}
int pthread_barrierattr_destroy(pthread_barrierattr_t *attr)
{
// Nothing to do here.
UNUSED(attr);
return 0;
}
int pthread_barrierattr_getpshared(const pthread_barrierattr_t *attr, int *pshared)
{
return pthread_getbarrierattr(attr, PTHREAD_PROCESS_SHARED, pshared);
}
int pthread_barrierattr_init(pthread_barrierattr_t *attr)
{
if (!attr)
return EINVAL;
attr->flags = 0;
return 0;
}
int pthread_barrierattr_setpshared(pthread_barrierattr_t *attr, int pshared)
{
return pthread_setbarrierattr(attr, PTHREAD_PROCESS_SHARED, pshared);
}
static void __stdcall pthread_apccancel(ULONG_PTR dwParam)
{
UNUSED(dwParam);
pthread_exit(NULL);
}
int pthread_cancel(pthread_t thread)
{
if (!thread || !(thread->flags & PTHREAD_CREATE_JOINABLE))
return EINVAL;
thread->flags |= PTHREAD_CANCELED;
// We can't implement a full POSIX-compatible cancel, it's just
// not possible on Windows. APIs like read, accept, sleep, simply
// have no way of being interrupted.
// The best we can do is to queue an APC, which will at least allow
// interruption of any alertable Windows functions, like SleepEx, ReadFileEx, etc.
// I'm not even going to try and implement asynchronous cancellation,
// as at best it just doesn't work, and at worst is just honestly dangerous.
if (QueueUserAPC(pthread_apccancel, thread->hThread, 0) == 0)
return EIO;
return 0;
}
void pthread_cleanup_push(void (*routine)(void *), void *arg)
{
pthread_t self = pthread_self();
pthread_cancel_t *top = (pthread_cancel_t *)allocmem(sizeof(pthread_cancel_t));
top->fn = routine;
top->arg = arg;
top->next = self->cleanup;
self->cleanup = top;
}
void pthread_cleanup_pop(int execute)
{
pthread_t self = pthread_self();
pthread_cancel_t *top = self->cleanup;
if (top)
{
self->cleanup = top->next;
if (execute)
{
top->fn(top->arg);
freemem(top);
}
}
}
int pthread_cond_broadcast(pthread_cond_t *cond)
{
if (!cond)
return EINVAL;
// Create on-demand if needed.
if (!cond->data)
{
int err = pthread_cond_ondemand(cond);
if (err)
return err;
}
WakeAllConditionVariable(&cond->data->cond);
return 0;
}
int pthread_cond_destroy(pthread_cond_t *cond)
{
if (!cond || !cond->data)
return EINVAL;
freemem(cond->data);
return 0;
}
int pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr)
{
if (!cond)
return EINVAL;
UNUSED(attr); // we don't support any of the attributes
cond->data = (struct pthread_conddata_t *)allocmem(sizeof(struct pthread_conddata_t));
if (cond->data == NULL)
return EAGAIN;
InitializeConditionVariable(&cond->data->cond);
return 0;
}
int pthread_cond_signal(pthread_cond_t *cond)
{
if (!cond)
return EINVAL;
// Create on-demand if needed.
if (!cond->data)
{
int err = pthread_cond_ondemand(cond);
if (err)
return err;
}
WakeConditionVariable(&cond->data->cond);
return 0;
}
int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
{
if (!cond || !mutex)
return EINVAL;
// Create on-demand if needed.
if (!cond->data)
{
int err = pthread_cond_ondemand(cond);
if (err)
return err;
}
if (!mutex->data)
{
int err = pthread_mutex_ondemand(mutex);
if (err)
return err;
}
if (!SleepConditionVariableCS(&cond->data->cond, &mutex->data->crit, INFINITE))
return EPERM;
return 0;
}
static int pthread_setcondattr(pthread_condattr_t *attr, int mask, int flags)
{
if (!attr)
return EINVAL;
attr->flags = (attr->flags & ~mask) | (flags & mask);
return 0;
}
static int pthread_getcondattr(const pthread_condattr_t *attr, int mask, int *out)
{
if (!attr || !out)
return EINVAL;
*out = attr->flags & mask;
return 0;
}
int pthread_condattr_destroy(pthread_condattr_t *attr)
{
if (!attr)
return EINVAL;
// Nothing to do here.
return 0;
}
int pthread_condattr_getpshared(const pthread_condattr_t *attr, int *pshared)
{
return pthread_getcondattr(attr, PTHREAD_PROCESS_SHARED, pshared);
}
int pthread_condattr_init(pthread_condattr_t *attr)
{
if (!attr)
return EINVAL;
attr->flags = 0;
return 0;
}
int pthread_condattr_setpshared(pthread_condattr_t *attr, int pshared)
{
return pthread_setcondattr(attr, PTHREAD_PROCESS_SHARED, pshared);
}
int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start)(void *), void *arg)
{
pthread_attr_t tmp;
if (!thread || !start)
return EINVAL;
pthread_once(&thread_setup_once, thread_setup);
if (thread_setup_tls == TLS_OUT_OF_INDEXES)
return EAGAIN;
*thread = (struct pthread_info_t *)allocmem(sizeof(struct pthread_info_t));
if (!(*thread))
return EAGAIN;
if (!attr)
{
pthread_attr_init(&tmp);
attr = &tmp;
}
(*thread)->arg = arg;
(*thread)->start = start;
(*thread)->result = NULL;
(*thread)->flags = attr->flags;
(*thread)->cleanup = NULL;
if (attr->flags & PTHREAD_CREATE_JOINABLE)
(*thread)->refcount = 1;
else
(*thread)->refcount = 0;
(*thread)->hThread = (HANDLE)_beginthreadex(NULL, (unsigned)attr->stack, pthread_main, *thread, CREATE_SUSPENDED, NULL);
if ((*thread)->hThread == 0)
{
freemem(*thread);
return errno;
}
if (attr->flags & PTHREAD_INHERIT_SCHED)
{
SetThreadPriority((*thread)->hThread, GetThreadPriority(GetCurrentThread()));
} else {
SetThreadPriority((*thread)->hThread, attr->prio);
}
if (ResumeThread((*thread)->hThread) == -1)
return EAGAIN;
return 0;
}
int pthread_detach(pthread_t thread)
{
if (!thread || !(thread->flags & PTHREAD_CREATE_JOINABLE))
return EINVAL;
thread->flags &= ~PTHREAD_CREATE_JOINABLE;
pthread_unref(thread);
return 0;
}
int pthread_equal(pthread_t t1, pthread_t t2)
{
return t1 == t2;
}
void pthread_exit(void *value_ptr)
{
pthread_docleanup(value_ptr);
_endthreadex(0);
}
int pthread_getconcurrency(void)
{
return pthread_concurrency;
}
int pthread_getschedparam(pthread_t thread, int *policy, struct sched_param *param)
{
// Not supported.
UNUSED(thread); UNUSED(policy); UNUSED(param);
return EINVAL;
}
void *pthread_getspecific(pthread_key_t key)
{
return TlsGetValue(key);
}
int pthread_join(pthread_t thread, void **value_ptr)
{
DWORD i;
if (!thread || !(thread->flags & PTHREAD_CREATE_JOINABLE))
return EINVAL;
i = WaitForSingleObjectEx(thread->hThread, INFINITE, TRUE);
if (i != WAIT_OBJECT_0)
return EPERM;
if (value_ptr)
*value_ptr = thread->result;
return pthread_detach(thread);
}
int pthread_key_create(pthread_key_t *key, void (*destructor)(void *))
{
if (!key)
return EINVAL;
pthread_mutex_lock(&key_mutex);
if (key_count >= PTHREAD_KEYS_MAX)
{
pthread_mutex_unlock(&key_mutex);
return EAGAIN;
}
// Allocate a TLS slot for this key.
*key = TlsAlloc();
if (*key == TLS_OUT_OF_INDEXES)
{
pthread_mutex_unlock(&key_mutex);
return EAGAIN;
}
// Make a note of the destructor.
key_destructors[key_count].fn = destructor;
key_destructors[key_count].slot = *key;
key_count++;
pthread_mutex_unlock(&key_mutex);
return 0;
}
int pthread_key_delete(pthread_key_t key)
{
unsigned n = 0;
pthread_mutex_lock(&key_mutex);
// Find it in our table.
while (n < key_count)
{
if (key_destructors[n].slot == key)
break;
}
if (n >= key_count)
{
pthread_mutex_unlock(&key_mutex);
return EINVAL;
}
// Free it up.
TlsFree(key);
key_destructors[n] = key_destructors[key_count-1];
key_count--;
pthread_mutex_unlock(&key_mutex);
return 0;
}
int pthread_mutex_destroy(pthread_mutex_t *mutex)
{
if (!mutex)
return EINVAL;
if (mutex->data)
{
DeleteCriticalSection(&mutex->data->crit);
freemem(mutex->data);
}
return 0;
}
int pthread_mutex_getprioceiling(const pthread_mutex_t *mutex, int *prioceiling)
{
UNUSED(mutex); UNUSED(prioceiling);
return 0;
}
int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
{
if (!mutex)
return EINVAL;
UNUSED(attr); // we don't support any of the attributes
mutex->data = (struct pthread_mutexdata_t *)allocmem(sizeof(struct pthread_mutexdata_t));
if (mutex->data == NULL)
return EAGAIN;
InitializeCriticalSection(&mutex->data->crit);
return 0;
}
int pthread_mutex_lock(pthread_mutex_t *mutex)
{
if (!mutex)
return EINVAL;
// Create on-demand if needed.
if (!mutex->data)
{
int err = pthread_mutex_ondemand(mutex);
if (err)
return err;
}
EnterCriticalSection(&mutex->data->crit);
return 0;
}
int pthread_mutex_setprioceiling(pthread_mutex_t *mutex, int prioceiling, int *old_ceiling)
{
// Not supported.
UNUSED(mutex); UNUSED(prioceiling); UNUSED(old_ceiling);
return 0;
}
int pthread_mutex_trylock(pthread_mutex_t *mutex)
{
if (!mutex)
return EINVAL;
// Create on-demand if needed.
if (!mutex->data)
{
int err = pthread_mutex_ondemand(mutex);
if (err)
return err;
}
if (TryEnterCriticalSection(&mutex->data->crit))
return 0;
else
return EBUSY;
}
int pthread_mutex_unlock(pthread_mutex_t *mutex)
{
if (!mutex || !mutex->data)
return EINVAL;
LeaveCriticalSection(&mutex->data->crit);
return 0;
}
static int pthread_setmutexattr(pthread_mutexattr_t *attr, int mask, int flags)
{
if (!attr)
return EINVAL;
attr->flags = (attr->flags & ~mask) | (flags & mask);
return 0;
}
static int pthread_getmutexattr(const pthread_mutexattr_t *attr, int mask, int *out)
{
if (!attr || !out)
return EINVAL;
*out = attr->flags & mask;
return 0;
}
int pthread_mutexattr_destroy(pthread_mutexattr_t *attr)
{
// Nothing to do here.
UNUSED(attr);
return 0;
}
int pthread_mutexattr_getprioceiling(const pthread_mutexattr_t *attr, int *prioceiling)
{
// Not supported.
UNUSED(attr); UNUSED(prioceiling);
return EINVAL;
}
int pthread_mutexattr_getprotocol(const pthread_mutexattr_t *attr, int *protocol)
{
return pthread_getmutexattr(attr, PTHREAD_PRIO_INHERIT|PTHREAD_PRIO_PROTECT, protocol);
}
int pthread_mutexattr_getpshared(const pthread_mutexattr_t *attr, int *pshared)
{
return pthread_getmutexattr(attr, PTHREAD_PROCESS_SHARED, pshared);
}
int pthread_mutexattr_gettype(const pthread_mutexattr_t *attr, int *type)
{
return pthread_getmutexattr(attr, PTHREAD_MUTEX_ERRORCHECK|PTHREAD_MUTEX_RECURSIVE, type);
}
int pthread_mutexattr_init(pthread_mutexattr_t *attr)
{
if (!attr)
return EINVAL;
attr->flags = PTHREAD_MUTEX_NORMAL;
return 0;
}
int pthread_mutexattr_setprioceiling(pthread_mutexattr_t *attr, int prioceiling)
{
// Not supported.
UNUSED(attr); UNUSED(prioceiling);
return 0;
}
int pthread_mutexattr_setprotocol(pthread_mutexattr_t *attr, int protocol)
{
return pthread_setmutexattr(attr, PTHREAD_PRIO_INHERIT|PTHREAD_PRIO_PROTECT, protocol);
}
int pthread_mutexattr_setpshared(pthread_mutexattr_t *attr, int pshared)