1 files changed, 28 insertions, 0 deletions
diff --git a/05/musl-0.6.0/src/thread/pthread_mutex_trylock.c b/05/musl-0.6.0/src/thread/pthread_mutex_trylock.c
new file mode 100644
index 0000000..29268fd
--- /dev/null
+++ b/05/musl-0.6.0/src/thread/pthread_mutex_trylock.c
@@ -0,0 +1,28 @@
+#include "pthread_impl.h"
+
+int pthread_mutex_trylock(pthread_mutex_t *m)
+{
+	if (m->_m_type == PTHREAD_MUTEX_RECURSIVE) {
+		pthread_t self = pthread_self();
+		if (m->_m_owner == self->tid) {
+			if ((unsigned)m->_m_lock >= INT_MAX) return EAGAIN;
+			a_inc(&m->_m_lock);
+			return 0;
+		}
+		if (a_fetch_add(&m->_m_lock, 1)) {
+			if (a_fetch_add(&m->_m_lock, -1)==1 && m->_m_waiters)
+				__wake(&m->_m_lock, 1, 0);
+			return EBUSY;
+		}
+		m->_m_owner = self->tid;
+		return 0;
+	}
+
+	if (a_xchg(&m->_m_lock, 1))
+		if (m->_m_type == PTHREAD_MUTEX_ERRORCHECK
+		 && m->_m_owner == pthread_self()->tid) return EDEADLK;
+		else return EBUSY;
+	if (m->_m_type == PTHREAD_MUTEX_ERRORCHECK)
+		m->_m_owner = pthread_self()->tid;
+	return 0;
+}