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implement flockfile api, rework stdio locking

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This commit is contained in:
Rich Felker
2011-03-12 21:55:45 -05:00
parent d8d19f4d46
commit 5eb0d33ec0
9 changed files with 66 additions and 15 deletions
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4
src/internal/libc.h
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@ -15,6 +15,9 @@ struct __libc {
int (*rsyscall)(int, long, long, long, long, long, long);
void (**tsd_keys)(void *);
void (*fork_handler)(int);
FILE *ofl_head;
int ofl_lock;
void (*lockfile)(FILE *);
};
@ -36,6 +39,7 @@ extern struct __libc *__libc_loc(void) __attribute__((const));
/* Designed to avoid any overhead in non-threaded processes */
void __lock(volatile int *);
void __lockfile(FILE *);
#define LOCK(x) (libc.threads_minus_1 ? (__lock(x),1) : ((void)(x),1))
#define UNLOCK(x) (*(x)=0)
#define CANCELPT(x) (libc.cancelpt ? libc.cancelpt((x)),0 : (void)(x),0)