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(ia64_per_thread_cache): Initialize busy/lock member.

Browse source 
(get_script_cache): Return NULL if caching is disabled.  If
	HAVE_ATOMIC_OPS_H is defined, set the busy flag and if
	the script cache is busy already, return NULL.
(put_script_cache): Don't allow it to be called for UNW_CACHE_NONE case.
	If HAVE_ATOMIC_OPS_H is defined, clear the "busy" flag via
	AO_CLEAR.
(ia64_get_cached_proc_info): If we're unable to acquire the cache,
	return -UNW_ENOINFO.
(script_init): New function.
(script_new): Replace open code with call to script_init().
(uncached_find_save_locs): New function.
(ia64_find_save_locs): Move code for uncached case to
	uncached_find_save_locs().  If get_script_cache() is unable to
	lock the script-cache, fall back to uncached_find_save_locs().
(ia64_script_cache_init): Delete.

(Logical change 1.124)
This commit is contained in:
hp.com!davidm 2003-11-24 23:53:25 +00:00
parent e939f42941
commit 629d7d3263
1 changed files with 71 additions and 48 deletions
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119
src/ia64/Gscript-ia64.c
View file

@ -29,7 +29,14 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#include "unwind_i.h"
#ifdef HAVE___THREAD
static __thread struct ia64_script_cache ia64_per_thread_cache;
static __thread struct ia64_script_cache ia64_per_thread_cache =
{
#ifdef HAVE_ATOMIC_OPS_H
.busy = AO_TS_INITIALIZER
#else
.lock = PTHREAD_MUTEX_INITIALIZER
#endif
};
#endif
static inline unw_hash_index_t
@ -73,20 +80,25 @@ get_script_cache (unw_addr_space_t as, sigset_t *saved_sigmaskp)
struct ia64_script_cache *cache = &as->global_cache;
unw_caching_policy_t caching = as->caching_policy;
if (caching == UNW_CACHE_NONE)
return NULL;
#ifdef HAVE___THREAD
if (as->caching_policy == UNW_CACHE_PER_THREAD)
cache = &ia64_per_thread_cache;
#endif
if (likely (caching != UNW_CACHE_NONE))
#ifdef HAVE_ATOMIC_OPS_H
if (AO_test_and_set (&cache->busy) == AO_TS_SET)
return NULL;
#else
sigprocmask (SIG_SETMASK, &unwi_full_sigmask, saved_sigmaskp);
if (likely (caching == UNW_CACHE_GLOBAL))
{
sigprocmask (SIG_SETMASK, &unwi_full_sigmask, saved_sigmaskp);
if (likely (caching == UNW_CACHE_GLOBAL))
{
debug (200, "%s: acquiring lock\n", __FUNCTION__);
mutex_lock (&cache->lock);
}
debug (200, "%s: acquiring lock\n", __FUNCTION__);
mutex_lock (&cache->lock);
}
#endif
if (as->cache_generation != cache->generation)
{
@ -102,13 +114,16 @@ put_script_cache (unw_addr_space_t as, struct ia64_script_cache *cache,
{
unw_caching_policy_t caching = as->caching_policy;
if (likely (caching != UNW_CACHE_NONE))
{
debug (200, "%s: unmasking signals/releasing lock\n", __FUNCTION__);
if (likely (caching == UNW_CACHE_GLOBAL))
mutex_unlock (&cache->lock);
sigprocmask (SIG_SETMASK, saved_sigmaskp, NULL);
}
assert (caching != UNW_CACHE_NONE);
debug (200, "%s: unmasking signals/releasing lock\n", __FUNCTION__);
#ifdef HAVE_ATOMIC_OPS_H
AO_CLEAR (&cache->busy);
#else
if (likely (caching == UNW_CACHE_GLOBAL))
mutex_unlock (&cache->lock);
sigprocmask (SIG_SETMASK, saved_sigmaskp, NULL);
#endif
}
static struct ia64_script *
@ -152,6 +167,8 @@ ia64_get_cached_proc_info (struct cursor *c)
sigset_t saved_sigmask;
cache = get_script_cache (c->as, &saved_sigmask);
if (!cache)
return -UNW_ENOINFO; /* cache is busy */
{
script = script_lookup (cache, c);
if (script)
@ -161,6 +178,15 @@ ia64_get_cached_proc_info (struct cursor *c)
return script ? 0 : -UNW_ENOINFO;
}
static inline void
script_init (struct ia64_script *script, unw_word_t ip)
{
script->ip = ip;
script->hint = 0;
script->count = 0;
script->abi_marker = 0;
}
static inline struct ia64_script *
script_new (struct ia64_script_cache *cache, unw_word_t ip)
{
@ -206,10 +232,7 @@ script_new (struct ia64_script_cache *cache, unw_word_t ip)
script->coll_chain = cache->hash[index];
cache->hash[index] = script - cache->buckets;
script->ip = ip;
script->hint = 0;
script->count = 0;
script->abi_marker = 0;
script_init (script, ip);
return script;
}
@ -497,6 +520,26 @@ run_script (struct ia64_script *script, struct cursor *c)
return 0;
}
static int
uncached_find_save_locs (struct cursor *c)
{
struct ia64_script script;
int ret = 0;
if ((ret = ia64_fetch_proc_info (c, c->ip, 1)) < 0)
return ret;
script_init (&script, c->ip);
if ((ret = build_script (c, &script)) < 0)
{
if (ret != -UNW_ESTOPUNWIND)
dprintf ("%s: failed to build unwind script for ip %lx\n",
__FUNCTION__, (long) c->ip);
return ret;
}
return run_script (&script, c);
}
HIDDEN int
ia64_find_save_locs (struct cursor *c)
{
@ -505,29 +548,16 @@ ia64_find_save_locs (struct cursor *c)
sigset_t saved_sigmask;
int ret = 0;
if (unlikely (c->as->caching_policy == UNW_CACHE_NONE))
{
struct ia64_script tmp_script;
if ((ret = ia64_fetch_proc_info (c, c->ip, 1)) < 0)
return ret;
script = &tmp_script;
script->ip = c->ip;
script->hint = 0;
script->count = 0;
if ((ret = build_script (c, script)) < 0)
{
if (ret != -UNW_ESTOPUNWIND)
dprintf ("%s: failed to build unwind script for ip %lx\n",
__FUNCTION__, (long) c->ip);
return ret;
}
run_script (script, c);
return 0;
}
if (c->as->caching_policy == UNW_CACHE_NONE)
return uncached_find_save_locs (c);
cache = get_script_cache (c->as, &saved_sigmask);
if (!cache)
{
debug (125, "%s: contention on script-cached; doing uncached lookup\n",
__FUNCTION__);
return uncached_find_save_locs (c);
}
{
script = script_lookup (cache, c);
debug (125, "%s: ip %lx %s in script cache\n",
@ -559,16 +589,9 @@ ia64_find_save_locs (struct cursor *c)
goto out;
}
run_script (script, c);
ret = run_script (script, c);
}
out:
put_script_cache (c->as, cache, &saved_sigmask);
return ret;
}
HIDDEN void
ia64_script_cache_init (struct ia64_script_cache *cache)
{
mutex_init (&cache->lock);
flush_script_cache (cache);
}