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Wait if there is contention on the cache

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The behavior on wait vs abort unwind depends on the locking primitive
chosen by the user. This makes the API consistent and independent of
the locking primitive.
This commit is contained in:
Paul Pluzhnikov 2009-09-25 09:38:55 -07:00 committed by Arun Sharma
parent 9aa0d6d680
commit 839db77b7b
2 changed files with 0 additions and 22 deletions
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4
include/dwarf.h
View file

@ -312,11 +312,7 @@ typedef unsigned char unw_hash_index_t;
struct dwarf_rs_cache
{
#ifdef HAVE_ATOMIC_OPS_H
AO_TS_t busy; /* is the rs-cache busy? */
#else
pthread_mutex_t lock;
#endif
unsigned short lru_head; /* index of lead-recently used rs */
unsigned short lru_tail; /* index of most-recently used rs */

18
src/dwarf/Gparser.c
View file

@ -481,21 +481,11 @@ get_rs_cache (unw_addr_space_t as, intrmask_t *saved_maskp)
if (caching == UNW_CACHE_NONE)
return NULL;
#ifdef HAVE_ATOMIC_H
if (!spin_trylock_irqsave (&cache->busy, *saved_maskp))
return NULL;
#else
# ifdef HAVE_ATOMIC_OPS_H
if (AO_test_and_set (&cache->busy) == AO_TS_SET)
return NULL;
# else
if (likely (caching == UNW_CACHE_GLOBAL))
{
Debug (16, "%s: acquiring lock\n", __FUNCTION__);
lock_acquire (&cache->lock, *saved_maskp);
}
# endif
#endif
if (atomic_read (&as->cache_generation) != atomic_read (&cache->generation))
{
@ -513,16 +503,8 @@ put_rs_cache (unw_addr_space_t as, struct dwarf_rs_cache *cache,
assert (as->caching_policy != UNW_CACHE_NONE);
Debug (16, "unmasking signals/interrupts and releasing lock\n");
#ifdef HAVE_ATOMIC_H
spin_unlock_irqrestore (&cache->busy, *saved_maskp);
#else
# ifdef HAVE_ATOMIC_OPS_H
AO_CLEAR (&cache->busy);
# else
if (likely (as->caching_policy == UNW_CACHE_GLOBAL))
lock_release (&cache->lock, *saved_maskp);
# endif
#endif
}
static inline unw_hash_index_t