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

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.

1 files changed, 19 insertions, 3 deletions

diff --git a/sys/src/ape/lib/ap/stdio/fclose.c b/sys/src/ape/lib/ap/stdio/fclose.c
index d14e83746..c3b157022 100644
--- a/sys/src/ape/lib/ap/stdio/fclose.c
+++ b/sys/src/ape/lib/ap/stdio/fclose.c
@@ -3,12 +3,28 @@
  */
 #include "iolib.h"
 int fclose(FILE *f){
-	int error=0;
+	int d, error=0;
+	char *p;
+
 	if(!f) return EOF;
 	if(f->state==CLOSED) return EOF;
 	if(fflush(f)==EOF) error=EOF;
-	if(f->flags&BALLOC) free(f->buf);
-	if(!(f->flags&STRING) && close(f->fd)<0) error=EOF;
+	if(f->flags&BALLOC){
+		if((p = f->buf)!=0){
+			f->buf = 0;
+			f->wp = 0;
+			f->rp = 0;
+			f->lp = 0;
+			free(p);
+		}
+	}
+	if(!(f->flags&STRING)){
+		if((d = f->fd)>=0){
+			f->fd = -1;
+			if(close(d) < 0)
+				error = EOF;
+		}
+	}
 	f->state=CLOSED;
 	f->flags=0;
 	return error;