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Add mutexes.

--- a/lib/crypto/rand.myr

+++ b/lib/crypto/rand.myr

@@ -1,4 +1,5 @@

 use std

+use thread

 use "entropy"

 use "sha256"

@@ -20,6 +21,7 @@

 var cnt	: std.size	/* count we've read since last stirring of entropy */

 var ctx	: chacha20ctx	/* the generator */

 var pid	: std.pid	/* for rekeying on fork and exec */

+var mtx	: thread.mutex	/* there can be only one */

 generic rand = {lo, hi

 	var span, lim, val, max

@@ -49,6 +51,7 @@

 const randbytes	 = {dst

 	var n, off, rdlen

+	thread.mtxlock(&mtx)

 	/* costly? */

 	if pid != std.getpid()

 		stir()

@@ -70,6 +73,7 @@

 			rekey([][:])

 		;;

 	;;

+	thread.mtxunlock(&mtx)

 }

 const stir = {