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runtime: check for errors returned by windows sema calls
Add checks for failure of CreateEvent, SetEvent or WaitForSingleObject. Any failures are considered fatal and will throw() after printing an informative message. Updates #16646 Change-Id: I3bacf9001d2abfa8667cc3aff163ff2de1c99915 Reviewed-on: https://go-review.googlesource.com/26655 Reviewed-by: Russ Cox <rsc@golang.org> Run-TryBot: Russ Cox <rsc@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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@ -437,6 +437,13 @@ func writeConsoleUTF16(handle uintptr, b []uint16) {
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//go:nosplit
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func semasleep(ns int64) int32 {
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const (
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_WAIT_ABANDONED = 0x00000080
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_WAIT_OBJECT_0 = 0x00000000
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_WAIT_TIMEOUT = 0x00000102
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_WAIT_FAILED = 0xFFFFFFFF
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)
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// store ms in ns to save stack space
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if ns < 0 {
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ns = _INFINITE
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@ -446,15 +453,44 @@ func semasleep(ns int64) int32 {
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ns = 1
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}
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}
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if stdcall2(_WaitForSingleObject, getg().m.waitsema, uintptr(ns)) != 0 {
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return -1 // timeout
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result := stdcall2(_WaitForSingleObject, getg().m.waitsema, uintptr(ns))
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switch result {
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case _WAIT_OBJECT_0: //signaled
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return 0
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case _WAIT_TIMEOUT:
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return -1
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case _WAIT_ABANDONED:
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systemstack(func() {
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throw("runtime.semasleep wait_abandoned")
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})
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case _WAIT_FAILED:
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systemstack(func() {
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print("runtime: waitforsingleobject wait_failed; errno=", getlasterror(), "\n")
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throw("runtime.semasleep wait_failed")
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})
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default:
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systemstack(func() {
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print("runtime: waitforsingleobject unexpected; result=", result, "\n")
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throw("runtime.semasleep unexpected")
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})
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}
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return 0
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return -1 // unreachable
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}
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//go:nosplit
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func semawakeup(mp *m) {
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stdcall1(_SetEvent, mp.waitsema)
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if stdcall1(_SetEvent, mp.waitsema) == 0 {
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systemstack(func() {
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print("runtime: setevent failed; errno=", getlasterror(), "\n")
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throw("runtime.semawakeup")
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})
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}
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}
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//go:nosplit
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@ -463,6 +499,12 @@ func semacreate(mp *m) {
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return
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}
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mp.waitsema = stdcall4(_CreateEventA, 0, 0, 0, 0)
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if mp.waitsema == 0 {
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systemstack(func() {
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print("runtime: createevent failed; errno=", getlasterror(), "\n")
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throw("runtime.semacreate")
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})
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}
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}
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// May run with m.p==nil, so write barriers are not allowed. This
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@ -475,6 +517,7 @@ func newosproc(mp *m, stk unsafe.Pointer) {
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thandle := stdcall6(_CreateThread, 0, 0x20000,
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funcPC(tstart_stdcall), uintptr(unsafe.Pointer(mp)),
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_STACK_SIZE_PARAM_IS_A_RESERVATION, 0)
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if thandle == 0 {
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print("runtime: failed to create new OS thread (have ", mcount(), " already; errno=", getlasterror(), ")\n")
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throw("runtime.newosproc")
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