#include "SDL_config.h"
#include <errno.h>
#include <pthread.h>
#include <semaphore.h>
#include <sys/time.h>
#include "SDL_thread.h"
#include "SDL_timer.h"

Functions
SDL_sem *	SDL_CreateSemaphore (Uint32 initial_value)

void	SDL_DestroySemaphore (SDL_sem *sem)

int	SDL_SemPost (SDL_sem *sem)

int	SDL_SemTryWait (SDL_sem *sem)

Uint32	SDL_SemValue (SDL_sem *sem)

int	SDL_SemWait (SDL_sem *sem)

int	SDL_SemWaitTimeout (SDL_sem *sem, Uint32 timeout)

Function Documentation

SDL_sem* SDL_CreateSemaphore ( Uint32 initial_value )

Create a semaphore, initialized with value, returns NULL on failure.

Definition at line 45 of file SDL_syssem.c.

References NULL, SDL_free(), SDL_malloc(), SDL_OutOfMemory, and SDL_SetError().

Referenced by PSP_EventInit(), SDL_CreateCond(), SDL_CreateMutex(), SDL_CreateThread(), SDL_SYS_JoystickInit(), and SDL_TimerInit().

void SDL_DestroySemaphore ( SDL_sem * sem )

Destroy a semaphore.

Definition at line 61 of file SDL_syssem.c.

References SDL_free().

Referenced by PSP_EventQuit(), SDL_CreateSemaphore(), SDL_CreateThread(), SDL_DestroyCond(), SDL_DestroyMutex(), SDL_SYS_JoystickQuit(), and SDL_TimerQuit().

int SDL_SemPost ( SDL_sem * sem )

Atomically increases the semaphore's count (not blocking).

Returns: 0, or -1 on error.

Definition at line 183 of file SDL_syssem.c.

References SDL_SetError().

Referenced by EventUpdate(), JoystickUpdate(), PSP_PumpEvents(), SDL_AddTimer(), SDL_CondBroadcast(), SDL_CondSignal(), SDL_CondWaitTimeout(), SDL_mutexV(), SDL_RunThread(), SDL_SYS_JoystickUpdate(), and SDL_TimerQuit().

int SDL_SemTryWait ( SDL_sem * sem )

Non-blocking variant of SDL_SemWait().

Returns: 0 if the wait succeeds, SDL_MUTEX_TIMEDOUT if the wait would block, and -1 on error.

Definition at line 70 of file SDL_syssem.c.

References SDL_MUTEX_TIMEDOUT, and SDL_SetError().

Referenced by SDL_SemWaitTimeout().

Uint32 SDL_SemValue ( SDL_sem * sem )

Returns the current count of the semaphore.

Definition at line 170 of file SDL_syssem.c.

References ret.

int SDL_SemWait ( SDL_sem * sem )

This function suspends the calling thread until the semaphore pointed to by sem has a positive count. It then atomically decreases the semaphore count.

Definition at line 85 of file SDL_syssem.c.

References SDL_SetError().

Referenced by EventUpdate(), JoystickUpdate(), PSP_PumpEvents(), SDL_CondBroadcast(), SDL_CondSignal(), SDL_CondWaitTimeout(), SDL_CreateThread(), SDL_LockMutex(), SDL_mutexP(), SDL_SemWaitTimeout(), SDL_SYS_JoystickUpdate(), and SDL_TryLockMutex().

int SDL_SemWaitTimeout	(	SDL_sem *	sem,
		Uint32	ms
	)

Variant of SDL_SemWait() with a timeout in milliseconds.

Returns: 0 if the wait succeeds, SDL_MUTEX_TIMEDOUT if the wait does not succeed in the allotted time, and -1 on error.

Warning: On some platforms this function is implemented by looping with a delay of 1 ms, and so should be avoided if possible.

Definition at line 101 of file SDL_syssem.c.

References NULL, SDL_Delay(), SDL_GetTicks(), SDL_MUTEX_MAXWAIT, SDL_MUTEX_TIMEDOUT, SDL_SemTryWait(), SDL_SemWait(), and SDL_SetError().

Referenced by SDL_CondWaitTimeout(), SDL_SemTryWait(), SDL_SemWait(), and SDL_TimerThread().

Functions

Function Documentation