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Change mutex tracking so that it only consumes memory in the core mutex object when it's actually being used.

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This reduces the overall size of a mutex which was 3016 bytes before this back
down to 216 bytes (this is on 64-bit Linux with a glibc-implemented mutex).
The exactness of the numbers here may vary slightly based upon how mutexes are
implemented on a platform, but the long and short of it is that prior to this
commit, chan_iax2 held down 98MB of memory on a 64-bit system for nothing more
than a table of 32767 locks.  After this commit, the same table occupies a mere
7MB of memory.

(closes issue #18194)
 Reported by: job
 Patches: 
       20110124__issue18194.diff.txt uploaded by tilghman (license 14)
 Tested by: tilghman
 
Review: https://reviewboard.asterisk.org/r/1066


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@304950 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Tilghman Lesher
2011-01-31 06:41:36 +00:00
parent b7d7fc94c2
commit fd11f34692
5 changed files with 337 additions and 266 deletions
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2
main/utils.c
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@@ -782,7 +782,7 @@ static void append_lock_information(struct ast_str **str, struct thr_lock_info *
return;
lock = lock_info->locks[i].lock_addr;
lt = &lock->track;
lt = lock->track;
ast_reentrancy_lock(lt);
for (j = 0; *str && j < lt->reentrancy; j++) {
ast_str_append(str, 0, "=== --- ---> Locked Here: %s line %d (%s)\n",