race: syscall changes
This is a part of a bigger change that adds data race detection feature:
https://golang.org/cl/6456044
The purpose of this patch is to provide coarse-grained synchronization
between all Read() and Write() calls.
R=rsc, bradfitz, alex.brainman
CC=golang-dev
https://golang.org/cl/6610064
diff --git a/src/pkg/syscall/syscall_unix.go b/src/pkg/syscall/syscall_unix.go
index d4e02f6..9783508 100644
--- a/src/pkg/syscall/syscall_unix.go
+++ b/src/pkg/syscall/syscall_unix.go
@@ -127,3 +127,20 @@
}
return "signal " + itoa(int(s))
}
+
+func Read(fd int, p []byte) (n int, err error) {
+ n, err = read(fd, p)
+ if raceenabled && err == nil {
+ raceAcquire(unsafe.Pointer(&ioSync))
+ }
+ return
+}
+
+func Write(fd int, p []byte) (n int, err error) {
+ if raceenabled {
+ raceReleaseMerge(unsafe.Pointer(&ioSync))
+ }
+ return write(fd, p)
+}
+
+var ioSync int64
