runtime: allow arbitrary return type in SetFinalizer.
finalize chan, to free OS X semaphore inside Lock.
os: finalize File, to close fd.
Fixes #503.
R=ken2
CC=golang-dev
https://golang.org/cl/204065
diff --git a/src/pkg/runtime/darwin/thread.c b/src/pkg/runtime/darwin/thread.c
index 56c9d17..38e3c23 100644
--- a/src/pkg/runtime/darwin/thread.c
+++ b/src/pkg/runtime/darwin/thread.c
@@ -48,10 +48,6 @@
// be >0, so it will increment the semaphore to wake up
// one of the others. This is the same algorithm used
// in Plan 9's user-level locks.
-//
-// Note that semaphores are never destroyed (the kernel
-// will clean up when the process exits). We assume for now
-// that Locks are only used for long-lived structures like M and G.
void
lock(Lock *l)
@@ -83,6 +79,14 @@
}
}
+void
+destroylock(Lock *l)
+{
+ if(l->sema != 0) {
+ mach_semdestroy(l->sema);
+ l->sema = 0;
+ }
+}
// User-level semaphore implementation:
// try to do the operations in user space on u,
