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