/*
* PGSemaphoreCreate
*
* Allocate a PGSemaphore structure with initial count 1
*/
PGSemaphore
PGSemaphoreCreate(void)
{
PGSemaphore sema;
sem_t *newsem;
/* Can't do this in a backend, because static state is postmaster's */
Assert(!IsUnderPostmaster);
if (numSems >= maxSems)
elog(PANIC, "too many semaphores created");
#ifdef USE_NAMED_POSIX_SEMAPHORES
newsem = PosixSemaphoreCreate();
/* Remember new sema for ReleaseSemaphores */
mySemPointers[numSems] = newsem;
sema = (PGSemaphore) newsem;
#else
sema = &sharedSemas[numSems];
newsem = PG_SEM_REF(sema);
PosixSemaphoreCreate(newsem);
#endif
numSems++;
return sema;
}
/*
* PGSemaphoreCreate
*
* Initialize a PGSemaphore structure to represent a sema with count 1
*/
void
PGSemaphoreCreate(PGSemaphore sema)
{
sem_t *newsem;
/* Can't do this in a backend, because static state is postmaster's */
Assert(!IsUnderPostmaster);
if (numSems >= maxSems)
elog(PANIC, "too many semaphores created");
#ifdef USE_NAMED_POSIX_SEMAPHORES
*sema = newsem = PosixSemaphoreCreate();
#else
PosixSemaphoreCreate(sema);
newsem = sema;
#endif
/* Remember new sema for ReleaseSemaphores */
mySemPointers[numSems++] = newsem;
}
