/**
 * POSIX Semaphores Emulation for AmigaOS
 * Copyright (C)2009 Diego Casorran
 * 
 * Public Domain as long this copyright notice is left unchanged.
 * 
 * Implementation conforms to POSIX.1-2008 where possible.
 */

#include "psem.h"
#include <string.h>	/* memset */

int sem_post (sem_t *__sem)
{
	psem_t *sem = sem2psem(__sem);
	
	ENTER();
	POINTER(sem);
	
	if(_PSEM_INVALID(sem))
	{
		DBG("Invalid sem_t provided, magic=%lx\n",((psem_t *)__sem)->magic);
		errno = EINVAL;
		return -1;
	}
	
	Forbid();
	if((_SSEM(sem)->ss_QueueCount != -1)
	&& ((_SSEM(sem)->ss_Owner == NULL) || (_SSEM(sem)->ss_Owner == FindTask(NULL))))
	{
		ReleaseSemaphore(_SSEM(sem));
	}
	if((sem->flags & SEMF_EXPUNGE) && (_SSEM(sem)->ss_QueueCount == -1))
	{
		DBG("Delayed expunge will take action now...\n");
		psem_destroy(sem);
		memset(__sem,_PSEM_ERASEDBIT,sizeof(*__sem));
	}
	Permit();
	
	LEAVE();
	return 0;
}