120 lines
2.4 KiB
C
120 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "mutex.h"
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#include "debug.h"
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#include <linux/string.h>
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#include <errno.h>
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static void check_err(const char *fn, int err)
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{
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char sbuf[STRERR_BUFSIZE];
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if (err == 0)
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return;
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pr_err("%s error: '%s'\n", fn, str_error_r(err, sbuf, sizeof(sbuf)));
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}
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#define CHECK_ERR(err) check_err(__func__, err)
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static void __mutex_init(struct mutex *mtx, bool pshared)
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{
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pthread_mutexattr_t attr;
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CHECK_ERR(pthread_mutexattr_init(&attr));
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#ifndef NDEBUG
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/* In normal builds enable error checking, such as recursive usage. */
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CHECK_ERR(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK));
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#endif
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if (pshared)
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CHECK_ERR(pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED));
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CHECK_ERR(pthread_mutex_init(&mtx->lock, &attr));
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CHECK_ERR(pthread_mutexattr_destroy(&attr));
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}
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void mutex_init(struct mutex *mtx)
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{
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__mutex_init(mtx, /*pshared=*/false);
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}
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void mutex_init_pshared(struct mutex *mtx)
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{
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__mutex_init(mtx, /*pshared=*/true);
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}
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void mutex_destroy(struct mutex *mtx)
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{
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CHECK_ERR(pthread_mutex_destroy(&mtx->lock));
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}
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void mutex_lock(struct mutex *mtx)
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NO_THREAD_SAFETY_ANALYSIS
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{
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CHECK_ERR(pthread_mutex_lock(&mtx->lock));
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}
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void mutex_unlock(struct mutex *mtx)
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NO_THREAD_SAFETY_ANALYSIS
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{
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CHECK_ERR(pthread_mutex_unlock(&mtx->lock));
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}
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bool mutex_trylock(struct mutex *mtx)
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{
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int ret = pthread_mutex_trylock(&mtx->lock);
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if (ret == 0)
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return true; /* Lock acquired. */
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if (ret == EBUSY)
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return false; /* Lock busy. */
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/* Print error. */
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CHECK_ERR(ret);
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return false;
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}
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static void __cond_init(struct cond *cnd, bool pshared)
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{
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pthread_condattr_t attr;
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CHECK_ERR(pthread_condattr_init(&attr));
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if (pshared)
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CHECK_ERR(pthread_condattr_setpshared(&attr, PTHREAD_PROCESS_SHARED));
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CHECK_ERR(pthread_cond_init(&cnd->cond, &attr));
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CHECK_ERR(pthread_condattr_destroy(&attr));
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}
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void cond_init(struct cond *cnd)
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{
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__cond_init(cnd, /*pshared=*/false);
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}
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void cond_init_pshared(struct cond *cnd)
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{
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__cond_init(cnd, /*pshared=*/true);
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}
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void cond_destroy(struct cond *cnd)
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{
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CHECK_ERR(pthread_cond_destroy(&cnd->cond));
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}
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void cond_wait(struct cond *cnd, struct mutex *mtx)
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{
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CHECK_ERR(pthread_cond_wait(&cnd->cond, &mtx->lock));
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}
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void cond_signal(struct cond *cnd)
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{
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CHECK_ERR(pthread_cond_signal(&cnd->cond));
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}
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void cond_broadcast(struct cond *cnd)
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{
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CHECK_ERR(pthread_cond_broadcast(&cnd->cond));
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}
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