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Disable usage of sched_setscheduler() on Apple devices #19

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merged 1 commit into from
Nov 5, 2018
Merged

Disable usage of sched_setscheduler() on Apple devices #19

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59 changes: 51 additions & 8 deletions dht.go.h
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,35 @@
#include <time.h>
#include <unistd.h>

// Add general block to detect OS
#ifdef _WIN32
//define something for Windows (32-bit and 64-bit, this part is common)
#ifdef _WIN64
//define something for Windows (64-bit only)
#else
//define something for Windows (32-bit only)
#endif
#elif __APPLE__
#include "TargetConditionals.h"
#if TARGET_IPHONE_SIMULATOR
// iOS Simulator
#elif TARGET_OS_IPHONE
// iOS device
#elif TARGET_OS_MAC
// Other kinds of Mac OS
#else
# error "Unknown Apple platform"
#endif
#elif __linux__
// linux
#elif __unix__ // all unices not caught above
// Unix
#elif defined(_POSIX_VERSION)
// POSIX
#else
# error "Unknown compiler"
#endif

// GPIO direction: receive either output data to specific GPIO pin.
#define IN 0
#define OUT 1
Expand Down Expand Up @@ -293,6 +322,8 @@ static int gpio_read_seq_until_timeout(Pin *pin,
return 0;
}

#if !defined(__APPLE__) // sched_setscheduler() doesn't defined on Apple devices

// Used to gain maximum performance from device during
// receiving bunch of data from sensors like DHTxx.
static int set_max_priority(Error **err) {
Expand Down Expand Up @@ -321,6 +352,8 @@ static int set_default_priority(Error **err) {
return 0;
}

#endif // sched_setscheduler() doesn't defined on Apple devices

typedef struct {
int time;
int edge;
Expand Down Expand Up @@ -364,10 +397,16 @@ static int blink_n_times(int pin, int n, Error **err) {
// Activate DHTxx sensor and collect data sent by sensor for futher processing.
static int dial_DHTxx_and_read(int32_t pin, int32_t boostPerfFlag,
int32_t **arr, int32_t *arr_len, Error **err) {
// Set maximum priority for GPIO processing.
if (boostPerfFlag != FALSE && -1 == set_max_priority(err)) {
return -1;
}

#if !defined(__APPLE__)
// Set maximum priority for GPIO processing.
if (boostPerfFlag != FALSE && -1 == set_max_priority(err)) {
return -1;
}
#else
#warning "Darwin doesn't have sched_setscheduler, so parameter boostPerfFlag is useless on Apple devices"
#endif

Pin p;
if (-1 == gpio_export(pin, &p, err)) {
gpio_unexport(&p, err);
Expand Down Expand Up @@ -415,10 +454,14 @@ static int dial_DHTxx_and_read(int32_t pin, int32_t boostPerfFlag,
set_default_priority(err);
return -1;
}
// Return normal thread priority.
if (boostPerfFlag != FALSE && -1 == set_default_priority(err)) {
return -1;
}

#if !defined(__APPLE__)
// Return normal thread priority.
if (boostPerfFlag != FALSE && -1 == set_default_priority(err)) {
return -1;
}
#endif

return 0;
}

Expand Down