diff options
Diffstat (limited to 'linux/lock.c')
| -rw-r--r-- | linux/lock.c | 34 |
1 files changed, 14 insertions, 20 deletions
diff --git a/linux/lock.c b/linux/lock.c index ab1c0742..e8c1eff1 100644 --- a/linux/lock.c +++ b/linux/lock.c @@ -1,6 +1,6 @@ /* lock.c -- IOCTLs for locking -*- linux-c -*- * Created: Tue Feb 2 08:37:54 1999 by faith@precisioninsight.com - * Revised: Tue Oct 12 08:51:06 1999 by faith@precisioninsight.com + * Revised: Mon Dec 6 16:04:44 1999 by faith@precisioninsight.com * * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. * All Rights Reserved. @@ -48,17 +48,15 @@ int drm_unblock(struct inode *inode, struct file *filp, unsigned int cmd, int drm_lock_take(__volatile__ unsigned int *lock, unsigned int context) { - unsigned int old; - unsigned int new; - char failed; + unsigned int old, new, prev; DRM_DEBUG("%d attempts\n", context); do { old = *lock; if (old & _DRM_LOCK_HELD) new = old | _DRM_LOCK_CONT; else new = context | _DRM_LOCK_HELD; - _DRM_CAS(lock, old, new, failed); - } while (failed); + prev = cmpxchg(lock, old, new); + } while (prev != old); if (_DRM_LOCKING_CONTEXT(old) == context) { if (old & _DRM_LOCK_HELD) { if (context != DRM_KERNEL_CONTEXT) { @@ -83,16 +81,14 @@ int drm_lock_take(__volatile__ unsigned int *lock, unsigned int context) int drm_lock_transfer(drm_device_t *dev, __volatile__ unsigned int *lock, unsigned int context) { - unsigned int old; - unsigned int new; - char failed; + unsigned int old, new, prev; dev->lock.pid = 0; do { - old = *lock; - new = context | _DRM_LOCK_HELD; - _DRM_CAS(lock, old, new, failed); - } while (failed); + old = *lock; + new = context | _DRM_LOCK_HELD; + prev = cmpxchg(lock, old, new); + } while (prev != old); DRM_DEBUG("%d => %d\n", _DRM_LOCKING_CONTEXT(old), context); return 1; } @@ -100,18 +96,16 @@ int drm_lock_transfer(drm_device_t *dev, int drm_lock_free(drm_device_t *dev, __volatile__ unsigned int *lock, unsigned int context) { - unsigned int old; - unsigned int new; - char failed; + unsigned int old, new, prev; pid_t pid = dev->lock.pid; DRM_DEBUG("%d\n", context); dev->lock.pid = 0; do { - old = *lock; - new = 0; - _DRM_CAS(lock, old, new, failed); - } while (failed); + old = *lock; + new = 0; + prev = cmpxchg(lock, old, new); + } while (prev != old); if (_DRM_LOCK_IS_HELD(old) && _DRM_LOCKING_CONTEXT(old) != context) { DRM_ERROR("%d freed heavyweight lock held by %d (pid %d)\n", context, |