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Implement __fsetlocking.

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The old __isthreaded hack was never very useful on Android because all user
code runs in a VM where there are lots of threads running. But __fsetlocking
lets a caller say "I'll worry about the locking for this FILE*", which is
useful for the normal case where you don't share a FILE* between threads
so you don't need any locking.

Bug: 17154740
Bug: 18593728
Change-Id: I2a8dddc29d3edff39a3d7d793387f2253608a68d
This commit is contained in:
Elliott Hughes
2015-01-20 18:09:05 -08:00
parent f374358414
commit 8c4994bbc1
5 changed files with 41 additions and 18 deletions
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9
libc/stdio/fileext.h
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@@ -33,6 +33,7 @@
#define _FILEEXT_H_
#include <pthread.h>
#include <stdbool.h>
__BEGIN_DECLS
@@ -40,9 +41,10 @@ __BEGIN_DECLS
* file extension
*/
struct __sfileext {
struct __sbuf _ub; /* ungetc buffer */
struct __sbuf _ub; /* ungetc buffer */
struct wchar_io_data _wcio; /* wide char io status */
pthread_mutex_t _lock; /* file lock */
pthread_mutex_t _lock; /* file lock */
bool _stdio_handles_locking; /* __fsetlocking support */
};
#define _EXT(fp) ((struct __sfileext *)((fp)->_ext._base))
@@ -54,7 +56,8 @@ do { \
_UB(fp)._base = NULL; \
_UB(fp)._size = 0; \
WCIO_INIT(fp); \
_FLOCK(fp).value = __PTHREAD_RECURSIVE_MUTEX_INIT_VALUE; \
_FLOCK(fp).value = __PTHREAD_RECURSIVE_MUTEX_INIT_VALUE; \
_EXT(fp)->_stdio_handles_locking = true; \
} while (0)
#define _FILEEXT_SETUP(f, fext) \