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runtime: remove sigmask type, use sigset instead
The OS-independent sigmask type was not pulling its weight. Replace it with the OS-dependent sigset type. This requires adding an OS-specific sigaddset function, but permits removing the OS-specific sigmaskToSigset function. Change-Id: I43307b512b0264ec291baadaea902f05ce212305 Reviewed-on: https://go-review.googlesource.com/29950 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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@ -300,10 +300,8 @@ func setSignalstackSP(s *stackt, sp uintptr) {
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//go:nosplit
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//go:nowritebarrierrec
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func sigmaskToSigset(m sigmask) sigset {
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var set sigset
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copy(set.__sigbits[:], m[:])
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return set
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func sigaddset(mask *sigset, i int) {
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mask.__sigbits[(i-1)/32] |= 1 << ((uint32(i) - 1) & 31)
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}
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func sigdelset(mask *sigset, i int) {
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@ -544,8 +544,8 @@ func setSignalstackSP(s *stackt, sp uintptr) {
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//go:nosplit
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//go:nowritebarrierrec
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func sigmaskToSigset(m sigmask) sigset {
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return sigset(m[0])
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func sigaddset(mask *sigset, i int) {
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*mask |= 1 << (uint32(i) - 1)
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}
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func sigdelset(mask *sigset, i int) {
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@ -273,10 +273,8 @@ func setSignalstackSP(s *stackt, sp uintptr) {
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//go:nosplit
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//go:nowritebarrierrec
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func sigmaskToSigset(m sigmask) sigset {
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var set sigset
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copy(set.__bits[:], m[:])
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return set
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func sigaddset(mask *sigset, i int) {
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mask.__bits[(i-1)/32] |= 1 << ((uint32(i) - 1) & 31)
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}
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func sigdelset(mask *sigset, i int) {
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@ -263,10 +263,8 @@ func setSignalstackSP(s *stackt, sp uintptr) {
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//go:nosplit
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//go:nowritebarrierrec
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func sigmaskToSigset(m sigmask) sigset {
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var set sigset
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copy(set.__bits[:], m[:])
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return set
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func sigaddset(mask *sigset, i int) {
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mask.__bits[(i-1)/32] |= 1 << ((uint32(i) - 1) & 31)
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}
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func sigdelset(mask *sigset, i int) {
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@ -31,6 +31,8 @@ type rlimit struct {
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var sigset_all = sigset{^uint32(0), ^uint32(0)}
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//go:nosplit
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//go:nowritebarrierrec
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func sigaddset(mask *sigset, i int) {
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(*mask)[(i-1)/32] |= 1 << ((uint32(i) - 1) & 31)
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}
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@ -42,11 +44,3 @@ func sigdelset(mask *sigset, i int) {
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func sigfillset(mask *uint64) {
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*mask = ^uint64(0)
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}
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//go:nosplit
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//go:nowritebarrierrec
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func sigmaskToSigset(m sigmask) sigset {
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var set sigset
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copy(set[:], m[:])
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return set
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}
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@ -47,6 +47,8 @@ type rlimit struct {
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var sigset_all = sigset{^uint64(0), ^uint64(0)}
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//go:nosplit
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//go:nowritebarrierrec
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func sigaddset(mask *sigset, i int) {
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(*mask)[(i-1)/64] |= 1 << ((uint32(i) - 1) & 63)
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}
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@ -58,11 +60,3 @@ func sigdelset(mask *sigset, i int) {
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func sigfillset(mask *[2]uint64) {
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(*mask)[0], (*mask)[1] = ^uint64(0), ^uint64(0)
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}
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//go:nosplit
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//go:nowritebarrierrec
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func sigmaskToSigset(m sigmask) sigset {
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var set sigset
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set[0] = uint64(m[0]) | uint64(m[1])<<32
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return set
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}
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@ -23,6 +23,8 @@ type rlimit struct {
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var sigset_all = sigset(^uint64(0))
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//go:nosplit
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//go:nowritebarrierrec
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func sigaddset(mask *sigset, i int) {
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if i > 64 {
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throw("unexpected signal greater than 64")
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@ -40,9 +42,3 @@ func sigdelset(mask *sigset, i int) {
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func sigfillset(mask *uint64) {
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*mask = ^uint64(0)
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}
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//go:nosplit
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//go:nowritebarrierrec
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func sigmaskToSigset(m sigmask) sigset {
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return sigset(uint64(m[0]) | uint64(m[1])<<32)
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}
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@ -301,10 +301,8 @@ func setSignalstackSP(s *stackt, sp uintptr) {
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//go:nosplit
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//go:nowritebarrierrec
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func sigmaskToSigset(m sigmask) sigset {
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var set sigset
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copy(set.__bits[:], m[:])
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return set
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func sigaddset(mask *sigset, i int) {
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mask.__bits[(i-1)/32] |= 1 << ((uint32(i) - 1) & 31)
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}
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func sigdelset(mask *sigset, i int) {
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@ -279,8 +279,8 @@ func setSignalstackSP(s *stackt, sp uintptr) {
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//go:nosplit
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//go:nowritebarrierrec
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func sigmaskToSigset(m sigmask) sigset {
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return sigset(m[0])
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func sigaddset(mask *sigset, i int) {
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*mask |= 1 << (uint32(i) - 1)
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}
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func sigdelset(mask *sigset, i int) {
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@ -36,11 +36,6 @@ const (
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// Signal forwarding is currently available only on Darwin and Linux.
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var fwdSig [_NSIG]uintptr
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// sigmask represents a general signal mask compatible with the GOOS
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// specific sigset types: the signal numbered x is represented by bit x-1
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// to match the representation expected by sigprocmask.
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type sigmask [(_NSIG + 31) / 32]uint32
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// channels for synchronizing signal mask updates with the signal mask
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// thread
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var (
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@ -302,7 +297,7 @@ func sigpanic() {
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//go:nowritebarrierrec
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func dieFromSignal(sig int32) {
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setsig(sig, _SIG_DFL, false)
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updatesigmask(sigmask{})
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unblocksig(sig)
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raise(sig)
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// That should have killed us. On some systems, though, raise
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@ -401,28 +396,25 @@ func ensureSigM() {
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// initially all signals except the essential. When signal.Notify()/Stop is called,
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// sigenable/sigdisable in turn notify this thread to update its signal
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// mask accordingly.
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var sigBlocked sigmask
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for i := range sigBlocked {
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sigBlocked[i] = ^uint32(0)
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}
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sigBlocked := sigset_all
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for i := range sigtable {
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if sigtable[i].flags&_SigUnblock != 0 {
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sigBlocked[(i-1)/32] &^= 1 << ((uint32(i) - 1) & 31)
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sigdelset(&sigBlocked, i)
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}
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}
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updatesigmask(sigBlocked)
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sigprocmask(_SIG_SETMASK, &sigBlocked, nil)
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for {
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select {
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case sig := <-enableSigChan:
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if b := sig - 1; sig > 0 {
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sigBlocked[b/32] &^= (1 << (b & 31))
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if sig > 0 {
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sigdelset(&sigBlocked, int(sig))
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}
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case sig := <-disableSigChan:
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if b := sig - 1; sig > 0 {
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sigBlocked[b/32] |= (1 << (b & 31))
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if sig > 0 {
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sigaddset(&sigBlocked, int(sig))
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}
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}
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updatesigmask(sigBlocked)
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sigprocmask(_SIG_SETMASK, &sigBlocked, nil)
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maskUpdatedChan <- struct{}{}
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}
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}()
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@ -554,22 +546,15 @@ func sigblock() {
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sigprocmask(_SIG_SETMASK, &sigset_all, nil)
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}
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// updatesigmask sets the current thread's signal mask to m.
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// unblocksig removes sig from the current thread's signal mask.
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// This is nosplit and nowritebarrierrec because it is called from
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// dieFromSignal, which can be called by sigfwdgo while running in the
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// signal handler, on the signal stack, with no g available.
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//go:nosplit
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//go:nowritebarrierrec
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func updatesigmask(m sigmask) {
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set := sigmaskToSigset(m)
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sigprocmask(_SIG_SETMASK, &set, nil)
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}
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// unblocksig removes sig from the current thread's signal mask.
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func unblocksig(sig int32) {
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var m sigmask
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m[(sig-1)/32] |= 1 << ((uint32(sig) - 1) & 31)
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set := sigmaskToSigset(m)
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var set sigset
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sigaddset(&set, int(sig))
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sigprocmask(_SIG_UNBLOCK, &set, nil)
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}
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