mirror of
https://github.com/fluencelabs/musl
synced 2025-05-29 15:41:36 +00:00
dba68bf98f
previously, stdio used spinlocks, which would be unacceptable if we ever add support for thread priorities, and which yielded pathologically bad performance if an application attempted to use flockfile on a key file as a major/primary locking mechanism. i had held off on making this change for fear that it would hurt performance in the non-threaded case, but actually support for recursive locking had already inflicted that cost. by having the internal locking functions store a flag indicating whether they need to perform unlocking, rather than using the actual recursive lock counter, i was able to combine the conditionals at unlock time, eliminating any additional cost, and also avoid a nasty corner case where a huge number of calls to ftrylockfile could cause deadlock later at the point of internal locking. this commit also fixes some issues with usage of pthread_self conflicting with __attribute__((const)) which resulted in crashes with some compiler versions/optimizations, mainly in flockfile prior to pthread_create.
104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
#ifndef _STDIO_IMPL_H
|
|
#define _STDIO_IMPL_H
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <stddef.h>
|
|
#include <stdarg.h>
|
|
#include <string.h>
|
|
#include <inttypes.h>
|
|
#include <wchar.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <limits.h>
|
|
#include <errno.h>
|
|
#include <termios.h>
|
|
#include <sys/ioctl.h>
|
|
#include <ctype.h>
|
|
#include <sys/wait.h>
|
|
#include <math.h>
|
|
#include <float.h>
|
|
#include <sys/uio.h>
|
|
#include "syscall.h"
|
|
#include "libc.h"
|
|
|
|
#define UNGET 8
|
|
|
|
#define FLOCK(f) int __need_unlock = ((f)->lock>=0 ? __lockfile((f)) : 0)
|
|
#define FUNLOCK(f) if (__need_unlock) __unlockfile((f)); else
|
|
|
|
#define F_PERM 1
|
|
#define F_NORD 4
|
|
#define F_NOWR 8
|
|
#define F_EOF 16
|
|
#define F_ERR 32
|
|
#define F_SVB 64
|
|
|
|
struct __FILE_s {
|
|
unsigned flags;
|
|
unsigned char *rpos, *rend;
|
|
int (*close)(FILE *);
|
|
unsigned char *wend, *wpos;
|
|
unsigned char *mustbezero_1;
|
|
unsigned char *wbase;
|
|
size_t (*read)(FILE *, unsigned char *, size_t);
|
|
size_t (*write)(FILE *, const unsigned char *, size_t);
|
|
off_t (*seek)(FILE *, off_t, int);
|
|
unsigned char *buf;
|
|
size_t buf_size;
|
|
FILE *prev, *next;
|
|
int fd;
|
|
int pipe_pid;
|
|
long lockcount;
|
|
short dummy3;
|
|
signed char mode;
|
|
signed char lbf;
|
|
int lock;
|
|
int waiters;
|
|
void *cookie;
|
|
off_t off;
|
|
int (*flush)(FILE *);
|
|
void *mustbezero_2;
|
|
};
|
|
|
|
size_t __stdio_read(FILE *, unsigned char *, size_t);
|
|
size_t __stdio_write(FILE *, const unsigned char *, size_t);
|
|
size_t __stdout_write(FILE *, const unsigned char *, size_t);
|
|
off_t __stdio_seek(FILE *, off_t, int);
|
|
int __stdio_close(FILE *);
|
|
|
|
int __toread(FILE *);
|
|
int __towrite(FILE *);
|
|
|
|
int __overflow(FILE *, int);
|
|
int __oflow(FILE *);
|
|
int __uflow(FILE *);
|
|
int __underflow(FILE *);
|
|
|
|
int __fseeko(FILE *, off_t, int);
|
|
int __fseeko_unlocked(FILE *, off_t, int);
|
|
off_t __ftello(FILE *);
|
|
off_t __ftello_unlocked(FILE *);
|
|
size_t __fwritex(const unsigned char *, size_t, FILE *);
|
|
int __putc_unlocked(int, FILE *);
|
|
|
|
FILE *__fdopen(int, const char *);
|
|
|
|
#define OFLLOCK() LOCK(&libc.ofl_lock)
|
|
#define OFLUNLOCK() UNLOCK(&libc.ofl_lock)
|
|
|
|
#define feof(f) ((f)->flags & F_EOF)
|
|
#define ferror(f) ((f)->flags & F_ERR)
|
|
|
|
#define getc_unlocked(f) \
|
|
( ((f)->rpos < (f)->rend) ? *(f)->rpos++ : __uflow((f)) )
|
|
|
|
#define putc_unlocked(c, f) ( ((c)!=(f)->lbf && (f)->wpos<(f)->wend) \
|
|
? *(f)->wpos++ = (c) : __overflow((f),(c)) )
|
|
|
|
/* Caller-allocated FILE * operations */
|
|
FILE *__fopen_rb_ca(const char *, FILE *, unsigned char *, size_t);
|
|
int __fclose_ca(FILE *);
|
|
|
|
#endif
|