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Fixed windows race condition between garbage collecting spawned process and exit handler, if the memory was reclaimed at just the right time

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This commit is contained in:
Bryan Roe
2019-11-28 09:57:04 -08:00
parent 847bb0aeb0
commit 37acfa64f0
3 changed files with 17 additions and 2 deletions
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4
microscript/ILibDuktape_ChildProcess.c
View File

@@ -102,7 +102,6 @@ void ILibDuktape_ChildProcess_SubProcess_ExitHandler(ILibProcessPipe_Process sen
p->exitCode = exitCode;
p->childProcess = NULL;
duk_push_heapptr(p->ctx, p->subProcess); // [childProcess]
#ifdef WIN32
@@ -194,6 +193,9 @@ duk_ret_t ILibDuktape_ChildProcess_waitExit(duk_context *ctx)
}
duk_ret_t ILibDuktape_ChildProcess_SpawnedProcess_Finalizer(duk_context *ctx)
{
ILibDuktape_ChildProcess_SubProcess *retVal = (ILibDuktape_ChildProcess_SubProcess*)Duktape_GetBufferProperty(ctx, 0, ILibDuktape_ChildProcess_MemBuf);
ILibProcessPipe_Process_RemoveHandlers(retVal->childProcess);
duk_get_prop_string(ctx, 0, "kill"); // [kill]
duk_dup(ctx, 0); // [kill][this]
duk_call_method(ctx, 0);

14
microstack/ILibProcessPipe.c
View File

@@ -112,6 +112,7 @@ typedef struct ILibProcessPipe_Process_Object
#ifdef WIN32
HANDLE hProcess;
int hProcess_needAdd;
int disabled;
#endif
void *chain;
}ILibProcessPipe_Process_Object;
@@ -1442,7 +1443,7 @@ void ILibProcessPipe_Pipe_Resume(ILibProcessPipe_Pipe pipeObject)
else
{
ILibProcessPipe_Pipe_ResumeEx(p);
if (p->mProcess != NULL && p->mProcess->hProcess_needAdd != 0)
if (p->mProcess != NULL && p->mProcess->hProcess_needAdd != 0 && p->mProcess->disabled == 0)
{
p->mProcess->hProcess_needAdd = 0;
ILibProcessPipe_WaitHandle_Add(p->manager, p->mProcess->hProcess, p->mProcess, ILibProcessPipe_Process_OnExit);
@@ -1567,6 +1568,7 @@ void ILibProcessPipe_Process_OnExit_ChainSink(void *chain, void *user)
ILibProcessPipe_Process_Object* j = (ILibProcessPipe_Process_Object*)user;
DWORD exitCode;
BOOL result;
if (j->disabled != 0) { return; }
if (ILibChain_SelectInterrupted(j->chain) != 0)
{
@@ -1598,6 +1600,7 @@ BOOL ILibProcessPipe_Process_OnExit(HANDLE event, ILibWaitHandle_ErrorStatus err
UNREFERENCED_PARAMETER(event);
ILibProcessPipe_WaitHandle_Remove(j->parent, j->hProcess);
if ((j->stdOut->PAUSED != 0 && j->stdOut->totalRead > 0) || (j->stdErr->PAUSED != 0 && j->stdErr->totalRead > 0))
{
j->hProcess_needAdd = 1;
@@ -1625,6 +1628,15 @@ void ILibProcessPipe_Process_UpdateUserObject(ILibProcessPipe_Process module, vo
{
((ILibProcessPipe_Process_Object*)module)->userObject = userObj;
}
void ILibProcessPipe_Process_RemoveHandlers(ILibProcessPipe_Process module)
{
ILibProcessPipe_Process_Object* j = (ILibProcessPipe_Process_Object*)module;
if (j != NULL && ILibMemory_CanaryOK(j))
{
j->disabled = 1;
ILibProcessPipe_WaitHandle_Remove(j->parent, j->hProcess);
}
}
void ILibProcessPipe_Process_AddHandlers(ILibProcessPipe_Process module, int bufferSize, ILibProcessPipe_Process_ExitHandler exitHandler, ILibProcessPipe_Process_OutputHandler stdOut, ILibProcessPipe_Process_OutputHandler stdErr, ILibProcessPipe_Process_SendOKHandler sendOk, void *user)
{
ILibProcessPipe_Process_Object* j = (ILibProcessPipe_Process_Object*)module;

1
microstack/ILibProcessPipe.h
View File

@@ -80,6 +80,7 @@ ILibProcessPipe_Process ILibProcessPipe_Manager_SpawnProcessEx4(ILibProcessPipe_
#define ILibProcessPipe_Manager_SpawnProcessWithExtraPipeMemory(pipeManager, target, parameters, memorySize) ILibProcessPipe_Manager_SpawnProcessEx2(pipeManager, target, parameters, ILibProcessPipe_SpawnTypes_DEFAULT, memorySize)
void ILibProcessPipe_Process_SoftKill(ILibProcessPipe_Process p);
void ILibProcessPipe_Process_AddHandlers(ILibProcessPipe_Process module, int bufferSize, ILibProcessPipe_Process_ExitHandler exitHandler, ILibProcessPipe_Process_OutputHandler stdOut, ILibProcessPipe_Process_OutputHandler stdErr, ILibProcessPipe_Process_SendOKHandler sendOk, void *user);
void ILibProcessPipe_Process_RemoveHandlers(ILibProcessPipe_Process module);
void ILibProcessPipe_Process_UpdateUserObject(ILibProcessPipe_Process module, void *userObj);
ILibTransport_DoneState ILibProcessPipe_Process_WriteStdIn(ILibProcessPipe_Process p, char* buffer, int bufferLen, ILibTransport_MemoryOwnership ownership);
void ILibProcessPipe_Process_CloseStdIn(ILibProcessPipe_Process p);