72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
#include "libnazgul.h"
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#include "ids.h"
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msgQueue *msgQueueInit(msgSpaceId externId, int queueIdx)
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{
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int queueFd;
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msgQueue *queue;
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sem_t *semProtectFd;
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msgQueueSemId queueSemProtectId;
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sem_t *semReadableFd;
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msgQueueSemId queueSemReadableId;
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msgQueueId queueId;
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queue = NULL;
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msgQueueProtSemIdIntern(queueSemProtectId, externId, queueIdx);
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msgQueueReadSemIdIntern(queueSemReadableId, externId, queueIdx);
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// creation du semaphore de lecture
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semReadableFd = sem_open(queueSemReadableId,
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O_CREAT | O_EXCL, SEM_DEFAULT_MODE, 0);
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if (semReadableFd == SEM_FAILED) {
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NZG_ERROR("sem_open", queueSemReadableId);
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goto ERROR;
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}
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// creation du semaphore de protection
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semProtectFd = sem_open(queueSemProtectId,
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O_CREAT | O_EXCL, SEM_DEFAULT_MODE, 0);
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if (semProtectFd == SEM_FAILED) {
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NZG_ERROR("sem_open", queueSemProtectId);
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goto ERROR;
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}
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/* if(sem_wait(semProtectFd)==-1){
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NZG_ERROR("sem_wait",queueSemProtectId);
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goto ERROR;
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} */
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if (msgQueueIdIntern(queueId, externId, queueIdx) < 0) {
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return NULL;
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}
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queueFd =
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shm_open(queueId, O_RDWR | O_CREAT | O_EXCL | O_TRUNC,
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MSGSPACE_DEFAULT_MODE);
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if (queueFd == -1) {
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NZG_ERROR("shm_open : queueInit", queueId);
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return NULL;
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}
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if (ftruncate(queueFd, sizeof(msgQueue)) == -1) {
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fprintf(stderr, "Queue resizing failed: %s\n", strerror(errno));
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return NULL;
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}
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queue = msgQueueOpen(queueId);
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/* on remplit la structure msgQueue */
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queue->elemCounter = 0;
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strcpy(queue->id, queueId);
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strcpy(queue->headId, queue->id);
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strcpy(queue->tailId, queue->id);
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/* on ferme tout ce qu'il faut */
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close(queueFd);
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msgQueueProtUnlock(externId, queueIdx);
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return queue;
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ERROR:
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return NULL;
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}
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