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authorJens Gustedt <Jens.Gustedt@inria.fr>2014-09-06 22:07:22 -0400
committerRich Felker <dalias@aerifal.cx>2014-09-06 22:07:22 -0400
commit8b0472932c1cb8cb2cc46322b21c0c4e21848522 (patch)
treea2c72eb0d39458bd87c4dc8b4810813d1b8a1819 /src
parente16f70f45210294321a88f23c85ac45046577adc (diff)
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add C11 mutex functions
Diffstat (limited to 'src')
-rw-r--r--src/thread/mtx_destroy.c5
-rw-r--r--src/thread/mtx_init.c10
-rw-r--r--src/thread/mtx_lock.c12
-rw-r--r--src/thread/mtx_timedlock.c14
-rw-r--r--src/thread/mtx_trylock.c17
-rw-r--r--src/thread/mtx_unlock.c11
6 files changed, 69 insertions, 0 deletions
diff --git a/src/thread/mtx_destroy.c b/src/thread/mtx_destroy.c
new file mode 100644
index 00000000..40a08999
--- /dev/null
+++ b/src/thread/mtx_destroy.c
@@ -0,0 +1,5 @@
+#include <threads.h>
+
+void mtx_destroy(mtx_t *mtx)
+{
+}
diff --git a/src/thread/mtx_init.c b/src/thread/mtx_init.c
new file mode 100644
index 00000000..4826f76b
--- /dev/null
+++ b/src/thread/mtx_init.c
@@ -0,0 +1,10 @@
+#include "pthread_impl.h"
+#include <threads.h>
+
+int mtx_init(mtx_t *m, int type)
+{
+ *m = (mtx_t){
+ ._m_type = ((type&mtx_recursive) ? PTHREAD_MUTEX_RECURSIVE : PTHREAD_MUTEX_NORMAL),
+ };
+ return thrd_success;
+}
diff --git a/src/thread/mtx_lock.c b/src/thread/mtx_lock.c
new file mode 100644
index 00000000..5c2415c1
--- /dev/null
+++ b/src/thread/mtx_lock.c
@@ -0,0 +1,12 @@
+#include "pthread_impl.h"
+#include <threads.h>
+
+int mtx_lock(mtx_t *m)
+{
+ if (m->_m_type == PTHREAD_MUTEX_NORMAL && !a_cas(&m->_m_lock, 0, EBUSY))
+ return thrd_success;
+ /* Calling mtx_timedlock with a null pointer is an extension.
+ * It is convenient, here to avoid duplication of the logic
+ * for return values. */
+ return mtx_timedlock(m, 0);
+}
diff --git a/src/thread/mtx_timedlock.c b/src/thread/mtx_timedlock.c
new file mode 100644
index 00000000..bcc152c5
--- /dev/null
+++ b/src/thread/mtx_timedlock.c
@@ -0,0 +1,14 @@
+#include <threads.h>
+#include <errno.h>
+
+int __pthread_mutex_timedlock(mtx_t *restrict, const struct timespec *restrict);
+
+int mtx_timedlock(mtx_t *restrict m, const struct timespec *restrict ts)
+{
+ int ret = __pthread_mutex_timedlock(m, ts);
+ switch (ret) {
+ default: return thrd_error;
+ case 0: return thrd_success;
+ case ETIMEDOUT: return thrd_timedout;
+ }
+}
diff --git a/src/thread/mtx_trylock.c b/src/thread/mtx_trylock.c
new file mode 100644
index 00000000..61e7694e
--- /dev/null
+++ b/src/thread/mtx_trylock.c
@@ -0,0 +1,17 @@
+#include "pthread_impl.h"
+#include <threads.h>
+
+int __pthread_mutex_trylock(mtx_t *);
+
+int mtx_trylock(mtx_t *m)
+{
+ if (m->_m_type == PTHREAD_MUTEX_NORMAL)
+ return (a_cas(&m->_m_lock, 0, EBUSY) & EBUSY) ? thrd_busy : thrd_success;
+
+ int ret = __pthread_mutex_trylock(m);
+ switch (ret) {
+ default: return thrd_error;
+ case 0: return thrd_success;
+ case EBUSY: return thrd_busy;
+ }
+}
diff --git a/src/thread/mtx_unlock.c b/src/thread/mtx_unlock.c
new file mode 100644
index 00000000..5033ace7
--- /dev/null
+++ b/src/thread/mtx_unlock.c
@@ -0,0 +1,11 @@
+#include <threads.h>
+
+int __pthread_mutex_unlock(mtx_t *);
+
+int mtx_unlock(mtx_t *mtx)
+{
+ /* The only cases where pthread_mutex_unlock can return an
+ * error are undefined behavior for C11 mtx_unlock, so we can
+ * assume it does not return an error and simply tail call. */
+ return __pthread_mutex_unlock(mtx);
+}