#include <config.h>
Include dependency graph for semaphore.h:
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Defines | |
#define | EAGAIN 0xffff |
the error code. More... | |
Typedefs | |
typedef unsigned char | sem_t |
the semaphore data-type. More... | |
Functions | |
int | sem_init (sem_t *sem, int pshared, unsigned int value) |
Initialize a semaphore. More... | |
int | sem_wait (sem_t *sem) |
Wait for semaphore (blocking). More... | |
int | sem_trywait (sem_t *sem) |
Try a wait for semaphore (non-blocking). More... | |
int | sem_post (sem_t *sem) |
Post a semaphore. More... | |
int | sem_getvalue (sem_t *sem, int *sval) |
Get the semaphore value. More... | |
int | sem_destroy (sem_t *sem) |
We're done with the semaphore, destroy it. More... |
Definition in file semaphore.h.
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the error code.
Definition at line 45 of file semaphore.h. |
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the semaphore data-type.
Definition at line 43 of file semaphore.h. Referenced by sem_destroy(), sem_getvalue(), and sem_init(). |
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We're done with the semaphore, destroy it. sem_destroy() destroys a semaphore object, freeing the resources it might hold.
Definition at line 117 of file semaphore.h. References sem_t. |
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Get the semaphore value.
Definition at line 102 of file semaphore.h. References sem_t. |
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Initialize a semaphore. sem_init() initializes the semaphore object pointed to by {sem} by setting its internal count to {value}
Definition at line 61 of file semaphore.h. References sem_t. |
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Post a semaphore. sem_post() atomically increases the count of the semaphore pointed to by {sem}. This function never blocks and can safely be used in asynchronous signal handlers.
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Try a wait for semaphore (non-blocking). sem_trywait() is a non-blocking variant of sem_wait(). If the semaphore pointed to by {sem} has non-zero count, the count is atomically decreased and sem_trywait immediately returns 0. If the semaphore count is zero, sem_trywait immediately returns with error EAGAIN.
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Wait for semaphore (blocking). sem_wait() suspends the calling task until the semaphore pointed to by {sem} has non-zero count. It then atomically decreases the semaphore count.
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Original code copyright 1998-2002 by the authors. |