runtime: fix Plan 9 build
This change adds the osyield and usleep
functions and code to read the number of
processors from /dev/sysstat.
I also changed SysAlloc to return nil
when brk fails (it was returning -1).
R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5177049
diff --git a/src/pkg/runtime/plan9/386/sys.s b/src/pkg/runtime/plan9/386/sys.s
index 1cb570b..a15362f 100644
--- a/src/pkg/runtime/plan9/386/sys.s
+++ b/src/pkg/runtime/plan9/386/sys.s
@@ -14,9 +14,21 @@
INT $64
RET
+// TODO(ality): remove use of deprecated system calls
+
+TEXT runtime·read(SB),7,$0
+ MOVL $15, AX
+ INT $64
+ RET
+
TEXT runtime·write(SB),7,$0
- MOVL $20, AX
- INT $64
+ MOVL $20, AX
+ INT $64
+ RET
+
+TEXT runtime·close(SB),7,$0
+ MOVL $4, AX
+ INT $64
RET
TEXT runtime·exits(SB),7,$0
@@ -29,6 +41,11 @@
INT $64
RET
+TEXT runtime·sleep(SB),7,$0
+ MOVL $17, AX
+ INT $64
+ RET
+
TEXT runtime·plan9_semacquire(SB),7,$0
MOVL $37, AX
INT $64
