diff options
Diffstat (limited to 'mdk-stage1/dietlibc/libpthread/pthread_spinlock.c')
-rw-r--r-- | mdk-stage1/dietlibc/libpthread/pthread_spinlock.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/mdk-stage1/dietlibc/libpthread/pthread_spinlock.c b/mdk-stage1/dietlibc/libpthread/pthread_spinlock.c new file mode 100644 index 000000000..449782adf --- /dev/null +++ b/mdk-stage1/dietlibc/libpthread/pthread_spinlock.c @@ -0,0 +1,38 @@ +#include <time.h> +#include <pthread.h> +#include "thread_internal.h" + +static void __pthread_acquire(int * spinlock) +{ + int cnt = 0; + struct timespec tm; + + while (__testandset(spinlock)) { + if (cnt < MAX_SPIN_COUNT) { + sched_yield(); + cnt++; + } else { + tm.tv_sec = 0; + tm.tv_nsec = SPIN_SLEEP_DURATION; + __libc_nanosleep(&tm, 0); + cnt = 0; + } + } +} + +void __pthread_lock(struct _pthread_fastlock * lock) +{ + __pthread_acquire(&lock->__spinlock); +} + +int __pthread_trylock(struct _pthread_fastlock * lock) +{ + return __testandset(&lock->__spinlock); +} + +int __pthread_unlock(struct _pthread_fastlock * lock) +{ + return (lock->__spinlock = 0); +} + + |