mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-05-22 21:32:31 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Use re-entrant locks on stdio

Browse source
This commit is contained in:
Justine Tunney 2022-05-22 08:13:13 -07:00
parent 4e9662cbc7
commit 1f229e4efc
78 changed files with 427 additions and 179 deletions
Download patch file Download diff file Expand all files Collapse all files

47
libc/stdio/vfprintf.c
View file

@ -16,45 +16,16 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/fmt/fmt.h"
#include "libc/intrin/spinlock.h"
#include "libc/limits.h"
#include "libc/stdio/stdio.h"
#include "libc/sysv/errfuns.h"
struct state {
FILE *f;
int n;
};
static int vfprintfputchar(const char *s, struct state *t, size_t n) {
int rc;
if (n) {
_spinlock(&t->f->lock);
if (n == 1 && *s != '\n' && t->f->beg < t->f->size &&
t->f->bufmode != _IONBF) {
t->f->buf[t->f->beg++] = *s;
t->n += n;
rc = 0;
} else if (!fwrite_unlocked(s, 1, n, t->f)) {
rc = -1;
} else {
t->n += n;
rc = 0;
}
_spunlock(&t->f->lock);
} else {
rc = 0;
}
return 0;
}
/**
* Formats and writes text to stream.
* @see printf() for further documentation
*/
int(vfprintf)(FILE *f, const char *fmt, va_list va) {
struct state st[1] = {{f, 0}};
if (__fmt(vfprintfputchar, st, fmt, va) != -1) {
return st->n;
} else {
return -1;
}
int rc;
flockfile(f);
rc = (vfprintf_unlocked)(f, fmt, va);
funlockfile(f);
return rc;
}