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Merge pull request #529 from ourairquality/newlib-locks-combine

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newlib: add an option to combine some locks.
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Ruslan V. Uss 2017-12-28 06:48:28 +05:00 committed by GitHub
commit 4ec3659a04
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1 changed files with 19 additions and 0 deletions
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19
core/newlib_syscalls.c
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@ -247,6 +247,10 @@ extern _lock_t __sinit_recursive_mutex;
void init_newlib_locks()
{
_lock_init(&__arc4random_mutex);
#if 0
/* Separate mutex for each lock.
* Each mutex uses about 96 bytes which adds up. */
_lock_init(&__at_quick_exit_mutex);
//_lock_init(&__dd_hash_mutex);
_lock_init(&__tz_mutex);
@ -256,6 +260,21 @@ void init_newlib_locks()
_lock_init_recursive(&__malloc_recursive_mutex);
_lock_init_recursive(&__sfp_recursive_mutex);
_lock_init_recursive(&__sinit_recursive_mutex);
#else
/* Reuse the same mutex for all these, reducing memory usage. Newlib
* will still allocate other locks dynamically and some of those need
* to be separate such as the file lock where a thread might block with
* them held. */
__at_quick_exit_mutex = __arc4random_mutex;
//__dd_hash_mutex = __arc4random_mutex;
__tz_mutex = __arc4random_mutex;
__atexit_recursive_mutex = __arc4random_mutex;
__env_recursive_mutex = __arc4random_mutex;
__malloc_recursive_mutex = __arc4random_mutex;
__sfp_recursive_mutex = __arc4random_mutex;
__sinit_recursive_mutex = __arc4random_mutex;
#endif
locks_initialized = 1;
}