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optimize file locking: avoid cache-polluting writes to global storage

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This commit is contained in:
Rich Felker 2011-03-16 10:39:45 -04:00
parent 9dd7d7e3f6
commit 4d9cc0b399
2 changed files with 5 additions and 3 deletions
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6
src/stdio/flockfile.c
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@ -3,7 +3,9 @@
void flockfile(FILE *f) void flockfile(FILE *f)
{ {
pthread_self(); if (!libc.lockfile) {
libc.lockfile = __lockfile; pthread_self();
libc.lockfile = __lockfile;
}
__lockfile(f); __lockfile(f);
} }

2
src/stdio/ftrylockfile.c
View file

@ -3,7 +3,7 @@
int ftrylockfile(FILE *f) int ftrylockfile(FILE *f)
{ {
libc.lockfile = __lockfile; if (!libc.lockfile) libc.lockfile = __lockfile;
if (f->owner && f->owner == pthread_self()->tid) { if (f->owner && f->owner == pthread_self()->tid) {
if (f->lockcount == INT_MAX) if (f->lockcount == INT_MAX)
return -1; return -1;