core: add basic mutex and per-thread data support

core/include/blue/core/thread.h

@@ -0,0 +1,36 @@
+#ifndef BLUELIB_CORE_THREAD_H_
+#define BLUELIB_CORE_THREAD_H_
+
+#include <blue/core/bitop.h>
+#include <blue/core/misc.h>
+#include <stdbool.h>
+
+#if defined(__APPLE__) || defined(__linux__)
+#include <pthread.h>
+
+#define B_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
+
+typedef pthread_mutex_t b_mutex;
+#else
+#error Unsupported compiler/system
+#endif
+
+#define B_ONCE_INIT ((b_once)0)
+
+typedef struct b_thread b_thread;
+
+typedef int b_once;
+
+static inline bool b_init_once(b_once *once)
+{
+	int x = 0;
+	return b_cmpxchg(once, &x, 1);
+}
+
+BLUE_API b_thread *b_thread_self(void);
+
+BLUE_API bool b_mutex_lock(b_mutex *mut);
+BLUE_API bool b_mutex_trylock(b_mutex *mut);
+BLUE_API bool b_mutex_unlock(b_mutex *mut);
+
+#endif