Minimal support for non-semaphore-supporting systems

1 files changed, 21 insertions, 1 deletions

diff --git a/mutex.h b/mutex.h
index a341152..7d1b4b2 100644
--- a/mutex.h
+++ b/mutex.h
@@ -26,7 +26,7 @@
 
 #pragma once
 
-#ifdef USE_FUTEX
+#if defined(USE_FUTEX)
 
 #include <unistd.h>
 #include <sys/syscall.h>
@@ -61,6 +61,26 @@ inline void mutex_destroy(uint32_t *futex) {
 	return;
 }
 
+#elif defined(USE_MISERABLE_SPINLOCKS)
+
+#define MUTEX_TYPE char
+
+inline void mutex_init(char *lock) {
+	*lock = 0;
+}
+
+inline void mutex_lock(char *lock) {
+	while (__sync_lock_test_and_set(lock, 0x1));
+}
+
+inline void mutex_unlock(char *lock) {
+	__sync_lock_release(lock);
+}
+
+inline void mutex_destroy(char *lock) {
+	return;
+}
+
 #else
 
 #include <semaphore.h>