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cmd: promote read thread to proc

allows for loading without playback interruption

--- a/cmd.c

+++ b/cmd.c

@@ -312,7 +312,7 @@

 /* using a thread does slow down reads a bit */

 // FIXME: ugly

 static void

-rthread(void *efd)

+rproc(void *efd)

 {

 	int fd;

 	Dot d;

@@ -348,8 +348,8 @@

 		fprint(2, "procrfork: %r\n");

 		return -1;

 	}

-	if(rr && threadcreate(rthread, (int*)dup(epfd[1], -1), mainstacksize) < 0){

-		fprint(2, "threadcreate: %r\n");

+	if(rr && procrfork(rproc, (int*)dup(epfd[1], -1), mainstacksize, RFFDG) < 0){

+		fprint(2, "procrfork: %r\n");

 		return -1;

 	}

 	close(epfd[1]);

@@ -390,8 +390,8 @@

 	if((fd = open(s, OREAD)) < 0)

 		return -1;

-	if(threadcreate(rthread, (int*)fd, mainstacksize) < 0){

-		fprint(2, "threadcreate: %r\n");

+	if(procrfork(rproc, (int*)fd, mainstacksize, RFFDG) < 0){

+		fprint(2, "procrfork: %r\n");

 		return -1;

 	}

 	return 0;