Library support for cgo export.
These functions are used to call from a C function back to a
Go function. This only includes 386 support.
R=rsc
CC=golang-dev
https://golang.org/cl/834045
diff --git a/src/pkg/runtime/proc.c b/src/pkg/runtime/proc.c
index 1a1895d..169f90b 100644
--- a/src/pkg/runtime/proc.c
+++ b/src/pkg/runtime/proc.c
@@ -544,8 +544,8 @@
// The goroutine g is about to enter a system call.
// Record that it's not using the cpu anymore.
-// This is called only from the go syscall library, not
-// from the low-level system calls used by the runtime.
+// This is called only from the go syscall library and cgocall,
+// not from the low-level system calls used by the runtime.
void
·entersyscall(void)
{
@@ -604,6 +604,28 @@
gosched();
}
+// Start scheduling g1 again for a cgo callback.
+void
+startcgocallback(G* g1)
+{
+ lock(&sched);
+ g1->status = Grunning;
+ sched.msyscall--;
+ sched.mcpu++;
+ unlock(&sched);
+}
+
+// Stop scheduling g1 after a cgo callback.
+void
+endcgocallback(G* g1)
+{
+ lock(&sched);
+ g1->status = Gsyscall;
+ sched.mcpu--;
+ sched.msyscall++;
+ unlock(&sched);
+}
+
/*
* stack layout parameters.
* known to linkers.
