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ape/stdio: make fopen() quasi threadsafe for python

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python uses processes sharing memory. it requires at least fopen() to
be called by multiple threads at once so we introduce _IO_newfile()
which allocates the FILE structure slot under a lock.
This commit is contained in:
cinap_lenrek 2013-03-11 00:48:35 +01:00
parent 530a2bc5e9
commit 48b0c10681
14 changed files with 79 additions and 24 deletions
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3
sys/src/ape/lib/ap/stdio/_IO_getc.c
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@ -8,7 +8,7 @@ int _IO_getc(FILE *f){
default: /* CLOSED, WR, ERR, EOF */
return EOF;
case OPEN:
_IO_setvbuf(f);
if(_IO_setvbuf(f)!=0) return EOF;
case RDWR:
case RD:
if(f->flags&STRING) return EOF;
@ -17,6 +17,7 @@ int _IO_getc(FILE *f){
else
n = f->bufl;
cnt=read(f->fd, f->buf, n);
if(f->state==CLOSED) return EOF;
switch(cnt){
case -1: f->state=ERR; return EOF;
case 0: f->state=END; return EOF;