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cmd/link,runtime: switch openbsd/amd64 to pthreads
This switches openbsd/amd64 to thread creation via pthreads, rather than doing direct system calls. Update #36435 Change-Id: I1105d5c392aa3e4c445d99c8cb80b927712e3529 Reviewed-on: https://go-review.googlesource.com/c/go/+/250180 Trust: Joel Sing <[email protected]> Run-TryBot: Joel Sing <[email protected]> TryBot-Result: Go Bot <[email protected]> Reviewed-by: Cherry Zhang <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| // Copyright 2020 The Go Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
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| // +build openbsd,amd64 | ||
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| package runtime | ||
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| import ( | ||
| "unsafe" | ||
| ) | ||
|
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| var failThreadCreate = []byte("runtime: failed to create new OS thread\n") | ||
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| // mstart_stub provides glue code to call mstart from pthread_create. | ||
| func mstart_stub() | ||
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| // May run with m.p==nil, so write barriers are not allowed. | ||
| //go:nowritebarrierrec | ||
| func newosproc(mp *m) { | ||
| if false { | ||
| print("newosproc m=", mp, " g=", mp.g0, " id=", mp.id, " ostk=", &mp, "\n") | ||
| } | ||
|
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| // Initialize an attribute object. | ||
| var attr pthreadattr | ||
| if err := pthread_attr_init(&attr); err != 0 { | ||
| write(2, unsafe.Pointer(&failThreadCreate[0]), int32(len(failThreadCreate))) | ||
| exit(1) | ||
| } | ||
|
|
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| // Find out OS stack size for our own stack guard. | ||
| var stacksize uintptr | ||
| if pthread_attr_getstacksize(&attr, &stacksize) != 0 { | ||
| write(2, unsafe.Pointer(&failThreadCreate[0]), int32(len(failThreadCreate))) | ||
| exit(1) | ||
| } | ||
| mp.g0.stack.hi = stacksize // for mstart | ||
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| // Tell the pthread library we won't join with this thread. | ||
| if pthread_attr_setdetachstate(&attr, _PTHREAD_CREATE_DETACHED) != 0 { | ||
| write(2, unsafe.Pointer(&failThreadCreate[0]), int32(len(failThreadCreate))) | ||
| exit(1) | ||
| } | ||
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| // Finally, create the thread. It starts at mstart_stub, which does some low-level | ||
| // setup and then calls mstart. | ||
| var oset sigset | ||
| sigprocmask(_SIG_SETMASK, &sigset_all, &oset) | ||
| err := pthread_create(&attr, funcPC(mstart_stub), unsafe.Pointer(mp)) | ||
| sigprocmask(_SIG_SETMASK, &oset, nil) | ||
| if err != 0 { | ||
| write(2, unsafe.Pointer(&failThreadCreate[0]), int32(len(failThreadCreate))) | ||
| exit(1) | ||
| } | ||
|
|
||
| pthread_attr_destroy(&attr) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| // Copyright 2011 The Go Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
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| // +build openbsd,!amd64 | ||
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| package runtime | ||
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| import ( | ||
| "runtime/internal/sys" | ||
| "unsafe" | ||
| ) | ||
|
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| //go:noescape | ||
| func tfork(param *tforkt, psize uintptr, mm *m, gg *g, fn uintptr) int32 | ||
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| // May run with m.p==nil, so write barriers are not allowed. | ||
| //go:nowritebarrier | ||
| func newosproc(mp *m) { | ||
| stk := unsafe.Pointer(mp.g0.stack.hi) | ||
| if false { | ||
| print("newosproc stk=", stk, " m=", mp, " g=", mp.g0, " id=", mp.id, " ostk=", &mp, "\n") | ||
| } | ||
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| // Stack pointer must point inside stack area (as marked with MAP_STACK), | ||
| // rather than at the top of it. | ||
| param := tforkt{ | ||
| tf_tcb: unsafe.Pointer(&mp.tls[0]), | ||
| tf_tid: nil, // minit will record tid | ||
| tf_stack: uintptr(stk) - sys.PtrSize, | ||
| } | ||
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| var oset sigset | ||
| sigprocmask(_SIG_SETMASK, &sigset_all, &oset) | ||
| ret := tfork(¶m, unsafe.Sizeof(param), mp, mp.g0, funcPC(mstart)) | ||
| sigprocmask(_SIG_SETMASK, &oset, nil) | ||
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| if ret < 0 { | ||
| print("runtime: failed to create new OS thread (have ", mcount()-1, " already; errno=", -ret, ")\n") | ||
| if ret == -_EAGAIN { | ||
| println("runtime: may need to increase max user processes (ulimit -p)") | ||
| } | ||
| throw("runtime.newosproc") | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| // Copyright 2018 The Go Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
|
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| // +build darwin openbsd,amd64 | ||
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| package runtime | ||
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| import "unsafe" | ||
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| // Call fn with arg as its argument. Return what fn returns. | ||
| // fn is the raw pc value of the entry point of the desired function. | ||
| // Switches to the system stack, if not already there. | ||
| // Preserves the calling point as the location where a profiler traceback will begin. | ||
| //go:nosplit | ||
| func libcCall(fn, arg unsafe.Pointer) int32 { | ||
| // Leave caller's PC/SP/G around for traceback. | ||
| gp := getg() | ||
| var mp *m | ||
| if gp != nil { | ||
| mp = gp.m | ||
| } | ||
| if mp != nil && mp.libcallsp == 0 { | ||
| mp.libcallg.set(gp) | ||
| mp.libcallpc = getcallerpc() | ||
| // sp must be the last, because once async cpu profiler finds | ||
| // all three values to be non-zero, it will use them | ||
| mp.libcallsp = getcallersp() | ||
| } else { | ||
| // Make sure we don't reset libcallsp. This makes | ||
| // libcCall reentrant; We remember the g/pc/sp for the | ||
| // first call on an M, until that libcCall instance | ||
| // returns. Reentrance only matters for signals, as | ||
| // libc never calls back into Go. The tricky case is | ||
| // where we call libcX from an M and record g/pc/sp. | ||
| // Before that call returns, a signal arrives on the | ||
| // same M and the signal handling code calls another | ||
| // libc function. We don't want that second libcCall | ||
| // from within the handler to be recorded, and we | ||
| // don't want that call's completion to zero | ||
| // libcallsp. | ||
| // We don't need to set libcall* while we're in a sighandler | ||
| // (even if we're not currently in libc) because we block all | ||
| // signals while we're handling a signal. That includes the | ||
| // profile signal, which is the one that uses the libcall* info. | ||
| mp = nil | ||
| } | ||
| res := asmcgocall(fn, arg) | ||
| if mp != nil { | ||
| mp.libcallsp = 0 | ||
| } | ||
| return res | ||
| } |
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