From acc786cb5805d057932ada3e7c571bb8e901cd67 Mon Sep 17 00:00:00 2001 From: Alex Auvolat Date: Sat, 6 Dec 2014 23:15:06 +0100 Subject: Begin review of taking model : making things thread safe. --- kernel/include/mutex.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 kernel/include/mutex.h (limited to 'kernel/include/mutex.h') diff --git a/kernel/include/mutex.h b/kernel/include/mutex.h new file mode 100644 index 0000000..6814adf --- /dev/null +++ b/kernel/include/mutex.h @@ -0,0 +1,21 @@ +#pragma once + +#include + +#define MUTEX_LOCKED 1 +#define MUTEX_UNLOCKED 0 + + +typedef uint32_t mutex_t; + +void mutex_lock(mutex_t* mutex); //wait for mutex to be free +int mutex_try_lock(mutex_t* mutex); //lock mutex only if free, returns !0 if locked, 0 if was busy +void mutex_unlock(mutex_t* mutex); + +// the mutex code assumes a yield() function is defined somewhere +void yield(); + +#define STATIC_MUTEX(name) static mutex_t name __attribute__((section("locks"))) = MUTEX_UNLOCKED; + + +/* vim: set ts=4 sw=4 tw=0 noet :*/ -- cgit v1.2.3