diff options
| author | Eric Andersen <andersen@codepoet.org> | 2006-12-07 23:24:02 +0000 |
|---|---|---|
| committer | Eric Andersen <andersen@codepoet.org> | 2006-12-07 23:24:02 +0000 |
| commit | 1478c2de052374c6356db5513749a144c13791b1 (patch) | |
| tree | 3b22a3f8361f94c99508c497e240ecb71acf8641 /libc/stdlib/malloc-simple | |
| parent | 99d6c367c4820a072dc4ada51561df17e2093778 (diff) | |
Major cleanup of internal mutex locking. Be more consistant in how we do
things, and avoid potential deadlocks caused when a thread holding a uClibc
internal lock get canceled and terminates without releasing the lock. This
change also provides a single place, bits/uClibc_mutex.h, for thread libraries
to modify to change all instances of internal locking.
Diffstat (limited to 'libc/stdlib/malloc-simple')
| -rw-r--r-- | libc/stdlib/malloc-simple/alloc.c | 27 |
1 files changed, 13 insertions, 14 deletions
diff --git a/libc/stdlib/malloc-simple/alloc.c b/libc/stdlib/malloc-simple/alloc.c index e382cee55..0b842076d 100644 --- a/libc/stdlib/malloc-simple/alloc.c +++ b/libc/stdlib/malloc-simple/alloc.c @@ -113,12 +113,11 @@ void free(void *ptr) #endif #ifdef L_memalign -#ifdef __UCLIBC_HAS_THREADS__ -# include <pthread.h> -pthread_mutex_t __malloc_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP; -#endif -#define LOCK __pthread_mutex_lock(&__malloc_lock) -#define UNLOCK __pthread_mutex_unlock(&__malloc_lock) + +#include <bits/uClibc_mutex.h> +__UCLIBC_MUTEX_STATIC(__malloc_lock, PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP); +#define __MALLOC_LOCK __UCLIBC_MUTEX_LOCK(__malloc_lock) +#define __MALLOC_UNLOCK __UCLIBC_MUTEX_UNLOCK(__malloc_lock) /* List of blocks allocated with memalign or valloc */ struct alignlist @@ -137,7 +136,7 @@ int __libc_free_aligned(void *ptr) if (ptr == NULL) return 0; - LOCK; + __MALLOC_LOCK; for (l = _aligned_blocks; l != NULL; l = l->next) { if (l->aligned == ptr) { /* Mark the block as free */ @@ -148,7 +147,7 @@ int __libc_free_aligned(void *ptr) return 1; } } - UNLOCK; + __MALLOC_UNLOCK; return 0; } void * memalign (size_t alignment, size_t size) @@ -160,11 +159,10 @@ void * memalign (size_t alignment, size_t size) if (result == NULL) return NULL; - adj = (unsigned long int) ((unsigned long int) ((char *) result - - (char *) NULL)) % alignment; + adj = (unsigned long int) ((unsigned long int) ((char *) result - (char *) NULL)) % alignment; if (adj != 0) { struct alignlist *l; - LOCK; + __MALLOC_LOCK; for (l = _aligned_blocks; l != NULL; l = l->next) if (l->aligned == NULL) /* This slot is free. Use it. */ @@ -173,15 +171,16 @@ void * memalign (size_t alignment, size_t size) l = (struct alignlist *) malloc (sizeof (struct alignlist)); if (l == NULL) { free(result); - UNLOCK; - return NULL; + result = NULL; + goto DONE; } l->next = _aligned_blocks; _aligned_blocks = l; } l->exact = result; result = l->aligned = (char *) result + alignment - adj; - UNLOCK; +DONE: + __MALLOC_UNLOCK; } return result; |