diff options
Diffstat (limited to 'libddekit/lock.c')
| -rw-r--r-- | libddekit/lock.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/libddekit/lock.c b/libddekit/lock.c new file mode 100644 index 00000000..0f451dfd --- /dev/null +++ b/libddekit/lock.c @@ -0,0 +1,62 @@ +#include <l4/dde/ddekit/lock.h> +#include <l4/dde/ddekit/memory.h> + +#include <l4/lock/lock.h> +#include <l4/util/macros.h> + +#define DDEKIT_DEBUG_LOCKS 0 + +struct ddekit_lock { + l4lock_t lock; +}; + +void _ddekit_lock_init(struct ddekit_lock **mtx) { + *mtx = (struct ddekit_lock *) ddekit_simple_malloc(sizeof(struct ddekit_lock)); + (*mtx)->lock = L4LOCK_UNLOCKED; +} + +void _ddekit_lock_deinit(struct ddekit_lock **mtx) { + ddekit_simple_free(*mtx); + *mtx = NULL; +} + +void _ddekit_lock_lock(struct ddekit_lock **mtx) { +#if DDEKIT_DEBUG_LOCKS + if (&(*mtx)->lock == 0x35ac) + LOG("DOWN %p: "l4util_idfmt" <-> "l4util_idfmt, + &(*mtx)->lock, + l4util_idstr(l4_myself()), + l4util_idstr(l4thread_l4_id(l4lock_owner(&((*mtx)->lock))))); +#endif + l4lock_lock(&(*mtx)->lock); +#if DDEKIT_DEBUG_LOCKS + if (&(*mtx)->lock == 0x35ac) + LOG("DOWN %p! "l4util_idfmt, &(*mtx)->lock, l4util_idstr(l4_myself())); +#endif +} + +/* returns 0 on success, != 0 if it would block */ +int _ddekit_lock_try_lock(struct ddekit_lock **mtx) { + return l4lock_try_lock(&(*mtx)->lock) ? 0 : 1; +} + +void _ddekit_lock_unlock(struct ddekit_lock **mtx) { +#if DDEKIT_DEBUG_LOCKS + if (&(*mtx)->lock == 0x35ac) + LOG("UP %p: "l4util_idfmt" <-> "l4util_idfmt, + &(*mtx)->lock, + l4util_idstr(l4_myself()), + l4util_idstr(l4thread_l4_id(l4lock_owner(&((*mtx)->lock))))); +#endif + l4lock_unlock(&(*mtx)->lock); +#if DDEKIT_DEBUG_LOCKS + if (&(*mtx)->lock == 0x35ac) + LOG("UP %p! "l4util_idfmt, &(*mtx)->lock, l4util_idstr(l4_myself())); +#endif +} + + +int _ddekit_lock_owner(struct ddekit_lock **mtx) { + return (int)l4lock_owner(&(*mtx)->lock); +} + |