1 files changed, 83 insertions, 0 deletions
diff --git a/mutex.h b/mutex.h
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+// Written by: Test_User <hax@andrewyu.org>
+//
+// This is free and unencumbered software released into the public
+// domain.
+//
+// Anyone is free to copy, modify, publish, use, compile, sell, or
+// distribute this software, either in source code form or as a compiled
+// binary, for any purpose, commercial or non-commercial, and by any
+// means.
+//
+// In jurisdictions that recognize copyright laws, the author or authors
+// of this software dedicate any and all copyright interest in the
+// software to the public domain. We make this dedication for the benefit
+// of the public at large and to the detriment of our heirs and
+// successors. We intend this dedication to be an overt act of
+// relinquishment in perpetuity of all present and future rights to this
+// software under copyright law.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+// IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+
+#pragma once
+
+#ifdef USE_FUTEX
+
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <stdint.h>
+#include <linux/futex.h>
+
+#define SETUP_MUTEX() 0
+#define MUTEX_TYPE uint32_t
+
+inline int mutex_init(uint32_t *futex) {
+	*futex = 0;
+	return 0;
+}
+
+inline void mutex_lock(uint32_t *futex) {
+	uint32_t val;
+	while (val = __sync_lock_test_and_set(futex, 1))
+		syscall(SYS_futex, futex, FUTEX_WAIT, val, 0, 0, 0);
+}
+
+inline void mutex_unlock(uint32_t *futex) {
+	__sync_lock_release(futex);
+	syscall(SYS_futex, futex, FUTEX_WAKE, 1, 0, 0, 0);
+}
+
+inline void mutex_destroy(uint32_t *futex) {
+	return;
+}
+
+#else
+
+#include <pthread.h>
+
+#define SETUP_MUTEX() pthread_mutexattr_init(&pthread_mutexattr)
+#define MUTEX_TYPE pthread_mutex_t
+
+extern pthread_mutexattr_t pthread_mutexattr;
+inline int mutex_init(pthread_mutex_t *mutex) {
+	return pthread_mutex_init(mutex, &pthread_mutexattr);
+}
+
+inline void mutex_lock(pthread_mutex_t *mutex) {
+	pthread_mutex_lock(mutex);
+}
+
+inline void mutex_unlock(pthread_mutex_t *mutex) {
+	pthread_mutex_unlock(mutex);
+}
+
+inline void mutex_destroy(pthread_mutex_t *mutex) {
+	pthread_mutex_destroy(mutex);
+}
+
+#endif