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go/misc/cgo/test/cgo_test.go

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// 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.
runtime: scheduler, cgo reorganization * Change use of m->g0 stack (aka scheduler stack). * Provide runtime.mcall(f) to invoke f() on m->g0 stack. * Replace scheduler loop entry with runtime.mcall(schedule). Runtime.mcall eliminates the need for fake scheduler states that exist just to run a bit of code on the m->g0 stack (Grecovery, Gstackalloc). The elimination of the scheduler as a loop that stops and starts using gosave and gogo fixes a bad interaction with the way cgo uses the m->g0 stack. Cgo runs external (gcc-compiled) C functions on that stack, and then when calling back into Go, it sets m->g0->sched.sp below the added call frames, so that other uses of m->g0's stack will not interfere with those frames. Unfortunately, gogo (longjmp) back to the scheduler loop at this point would end up running scheduler with the lower sp, which no longer points at a valid stack frame for a call to scheduler. If scheduler then wrote any function call arguments or local variables to where it expected the stack frame to be, it would overwrite other data on the stack. I realized this possibility while debugging a problem with calling complex Go code in a Go -> C -> Go cgo callback. This wasn't the bug I was looking for, it turns out, but I believe it is a real bug nonetheless. Switching to runtime.mcall, which only adds new frames to the stack and never jumps into functions running in existing ones, fixes this bug. * Move cgo-related code out of proc.c into cgocall.c. * Add very large comment describing cgo call sequences. * Simpilify, regularize cgo function implementations and names. * Add test suite as misc/cgo/test. Now the Go -> C path calls cgocall, which calls asmcgocall, and the C -> Go path calls cgocallback, which calls cgocallbackg. The shuffling, which affects mainly the callback case, moves most of the callback implementation to cgocallback running on the m->curg stack (not the m->g0 scheduler stack) and only while accounted for with $GOMAXPROCS (between calls to exitsyscall and entersyscall). The previous callback code did not block in startcgocallback's approximation to exitsyscall, so if, say, the garbage collector were running, it would still barge in and start doing things like call malloc. Similarly endcgocallback's approximation of entersyscall did not call matchmg to kick off new OS threads when necessary, which caused the bug in issue 1560. Fixes #1560. R=iant CC=golang-dev https://golang.org/cl/4253054
2011-03-07 08:37:42 -07:00
package cgotest
import "testing"
// The actual test functions are in non-_test.go files
// so that they can use cgo (import "C").
// These wrappers are here for gotest to find.
func Test1328(t *testing.T) { test1328(t) }
func Test1635(t *testing.T) { test1635(t) }
func Test3250(t *testing.T) { test3250(t) }
func Test3729(t *testing.T) { test3729(t) }
func Test3775(t *testing.T) { test3775(t) }
func Test4029(t *testing.T) { test4029(t) }
func Test4339(t *testing.T) { test4339(t) }
func Test5227(t *testing.T) { test5227(t) }
func Test5242(t *testing.T) { test5242(t) }
func Test5337(t *testing.T) { test5337(t) }
func Test5548(t *testing.T) { test5548(t) }
func Test5603(t *testing.T) { test5603(t) }
func Test5986(t *testing.T) { test5986(t) }
func Test6390(t *testing.T) { test6390(t) }
func Test6833(t *testing.T) { test6833(t) }
func Test6907(t *testing.T) { test6907(t) }
func Test6907Go(t *testing.T) { test6907Go(t) }
func Test7560(t *testing.T) { test7560(t) }
func Test7665(t *testing.T) { test7665(t) }
func Test7978(t *testing.T) { test7978(t) }
func Test8092(t *testing.T) { test8092(t) }
func Test8517(t *testing.T) { test8517(t) }
func Test8694(t *testing.T) { test8694(t) }
func Test8811(t *testing.T) { test8811(t) }
func Test9557(t *testing.T) { test9557(t) }
func Test10303(t *testing.T) { test10303(t, 10) }
func Test11925(t *testing.T) { test11925(t) }
func Test12030(t *testing.T) { test12030(t) }
func Test14838(t *testing.T) { test14838(t) }
func Test17065(t *testing.T) { test17065(t) }
func Test17537(t *testing.T) { test17537(t) }
func Test18126(t *testing.T) { test18126(t) }
func Test18720(t *testing.T) { test18720(t) }
func Test20129(t *testing.T) { test20129(t) }
func Test20369(t *testing.T) { test20369(t) }
func Test20910(t *testing.T) { test20910(t) }
func Test21708(t *testing.T) { test21708(t) }
func Test21809(t *testing.T) { test21809(t) }
func Test21897(t *testing.T) { test21897(t) }
func Test22906(t *testing.T) { test22906(t) }
func Test23356(t *testing.T) { test23356(t) }
func Test24206(t *testing.T) { test24206(t) }
func Test25143(t *testing.T) { test25143(t) }
func Test26066(t *testing.T) { test26066(t) }
func Test27660(t *testing.T) { test27660(t) }
func Test28896(t *testing.T) { test28896(t) }
func Test30065(t *testing.T) { test30065(t) }
func Test32579(t *testing.T) { test32579(t) }
func Test31891(t *testing.T) { test31891(t) }
func Test45451(t *testing.T) { test45451(t) }
func TestAlign(t *testing.T) { testAlign(t) }
func TestAtol(t *testing.T) { testAtol(t) }
func TestBlocking(t *testing.T) { testBlocking(t) }
func TestBoolAlign(t *testing.T) { testBoolAlign(t) }
func TestCallGoWithString(t *testing.T) { testCallGoWithString(t) }
func TestCallback(t *testing.T) { testCallback(t) }
func TestCallbackCallers(t *testing.T) { testCallbackCallers(t) }
func TestCallbackGC(t *testing.T) { testCallbackGC(t) }
func TestCallbackPanic(t *testing.T) { testCallbackPanic(t) }
func TestCallbackPanicLocked(t *testing.T) { testCallbackPanicLocked(t) }
func TestCallbackPanicLoop(t *testing.T) { testCallbackPanicLoop(t) }
func TestCallbackStack(t *testing.T) { testCallbackStack(t) }
func TestCflags(t *testing.T) { testCflags(t) }
func TestCheckConst(t *testing.T) { testCheckConst(t) }
func TestConst(t *testing.T) { testConst(t) }
func TestCthread(t *testing.T) { testCthread(t) }
func TestEnum(t *testing.T) { testEnum(t) }
func TestNamedEnum(t *testing.T) { testNamedEnum(t) }
func TestCastToEnum(t *testing.T) { testCastToEnum(t) }
func TestErrno(t *testing.T) { testErrno(t) }
func TestFpVar(t *testing.T) { testFpVar(t) }
func TestHandle(t *testing.T) { testHandle(t) }
func TestHelpers(t *testing.T) { testHelpers(t) }
func TestLibgcc(t *testing.T) { testLibgcc(t) }
func TestMultipleAssign(t *testing.T) { testMultipleAssign(t) }
func TestNaming(t *testing.T) { testNaming(t) }
func TestPanicFromC(t *testing.T) { testPanicFromC(t) }
func TestParallelSleep(t *testing.T) { testParallelSleep(t) }
func TestPrintf(t *testing.T) { testPrintf(t) }
func TestReturnAfterGrow(t *testing.T) { testReturnAfterGrow(t) }
func TestReturnAfterGrowFromGo(t *testing.T) { testReturnAfterGrowFromGo(t) }
func TestSetEnv(t *testing.T) { testSetEnv(t) }
func TestThreadLock(t *testing.T) { testThreadLockFunc(t) }
func TestUnsignedInt(t *testing.T) { testUnsignedInt(t) }
func TestZeroArgCallback(t *testing.T) { testZeroArgCallback(t) }
func BenchmarkCgoCall(b *testing.B) { benchCgoCall(b) }
func BenchmarkGoString(b *testing.B) { benchGoString(b) }
func BenchmarkCGoCallback(b *testing.B) { benchCallback(b) }