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author | Alex Auvolat <alex.auvolat@ens.fr> | 2015-02-13 20:28:54 +0100 |
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committer | Alex Auvolat <alex.auvolat@ens.fr> | 2015-02-13 20:28:54 +0100 |
commit | cf0b8a52287ee7c747b1d5a7d77abdef1fb46f94 (patch) | |
tree | d06ada519003a0794d3107fea1e882b737b5a00c /src/common/mutex.c | |
parent | e484c92ff08e54e7cbfdb815a5b254507dade003 (diff) | |
download | kogata-cf0b8a52287ee7c747b1d5a7d77abdef1fb46f94.tar.gz kogata-cf0b8a52287ee7c747b1d5a7d77abdef1fb46f94.zip |
Reorganize code in preparation for user apps.
Diffstat (limited to 'src/common/mutex.c')
-rw-r--r-- | src/common/mutex.c | 27 |
1 files changed, 0 insertions, 27 deletions
diff --git a/src/common/mutex.c b/src/common/mutex.c deleted file mode 100644 index b345ee5..0000000 --- a/src/common/mutex.c +++ /dev/null @@ -1,27 +0,0 @@ -#include <mutex.h> - -/* Internal use only. This function is atomic, meaning it cannot be interrupted by a system task switch. */ -static uint32_t atomic_exchange(uint32_t* ptr, uint32_t newval) { - uint32_t r; - asm volatile("xchg (%%ecx), %%eax" : "=a"(r) : "c"(ptr), "a"(newval)); - return r; -} - -void mutex_lock(uint32_t* mutex) { - while (atomic_exchange(mutex, MUTEX_LOCKED) == MUTEX_LOCKED) { - yield(); - } -} - -bool mutex_try_lock(uint32_t* mutex) { - if (atomic_exchange(mutex, MUTEX_LOCKED) == MUTEX_LOCKED) { - return false; - } - return true; -} - -void mutex_unlock(uint32_t* mutex) { - *mutex = MUTEX_UNLOCKED; -} - -/* vim: set ts=4 sw=4 tw=0 noet :*/ |