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Make the operations on the global rng thread safe.

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R=r, rsc
CC=golang-dev
https://golang.org/cl/168041
This commit is contained in:
Roger Peppe 2009-12-09 12:55:19 -08:00 committed by Russ Cox
parent 3ca1b1d27f
commit 916533119e
1 changed files with 21 additions and 1 deletions
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22
src/pkg/rand/rand.go
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@ -5,6 +5,8 @@
// Package rand implements pseudo-random number generators.
package rand
import "sync"
// A Source represents a source of uniformly-distributed
// pseudo-random int64 values in the range [0, 1<<63).
type Source interface {
@ -91,7 +93,7 @@ func (r *Rand) Perm(n int) []int {
* Top-level convenience functions
*/
var globalRand = New(NewSource(1))
var globalRand = New(&lockedSource{src: NewSource(1)})
// Seed uses the provided seed value to initialize the generator to a deterministic state.
func Seed(seed int64) { globalRand.Seed(seed) }
@ -148,3 +150,21 @@ func NormFloat64() float64 { return globalRand.NormFloat64() }
// sample = ExpFloat64() / desiredRateParameter
//
func ExpFloat64() float64 { return globalRand.ExpFloat64() }
type lockedSource struct {
lk sync.Mutex;
src Source;
}
func (r *lockedSource) Int63() (n int64) {
r.lk.Lock();
n = r.src.Int63();
r.lk.Unlock();
return;
}
func (r *lockedSource) Seed(seed int64) {
r.lk.Lock();
r.src.Seed(seed);
r.lk.Unlock();
}