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Test for reentrance into non-recursive wxMutex. If it happens, yield dead lock error, don't hang

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55521 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Robert Roebling
2008-09-08 08:00:03 +00:00
parent 44b25eac69
commit 375f364ef2
2 changed files with 23 additions and 7 deletions
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19
src/unix/threadpsx.cpp
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@@ -189,6 +189,8 @@ private:
private:
pthread_mutex_t m_mutex;
bool m_isOk;
wxMutexType m_type;
unsigned long m_owningThread;
// wxConditionInternal uses our m_mutex
friend class wxConditionInternal;
@@ -203,6 +205,9 @@ extern "C" int pthread_mutexattr_settype(pthread_mutexattr_t *, int);
wxMutexInternal::wxMutexInternal(wxMutexType mutexType)
{
m_type = mutexType;
m_owningThread = 0;
int err;
switch ( mutexType )
{
@@ -263,6 +268,12 @@ wxMutexInternal::~wxMutexInternal()
wxMutexError wxMutexInternal::Lock()
{
if ((m_type == wxMUTEX_DEFAULT) && (m_owningThread != 0))
{
if (m_owningThread == wxThread::GetCurrentId())
return wxMUTEX_DEAD_LOCK;
}
return HandleLockResult(pthread_mutex_lock(&m_mutex));
}
@@ -318,6 +329,8 @@ wxMutexError wxMutexInternal::Lock(unsigned long ms)
wxMutexError wxMutexInternal::HandleLockResult(int err)
{
// wxPrintf( "err %d\n", err );
switch ( err )
{
case EDEADLK:
@@ -334,6 +347,8 @@ wxMutexError wxMutexInternal::HandleLockResult(int err)
return wxMUTEX_TIMEOUT;
case 0:
if (m_type == wxMUTEX_DEFAULT)
m_owningThread = wxThread::GetCurrentId();
return wxMUTEX_NO_ERROR;
default:
@@ -359,6 +374,8 @@ wxMutexError wxMutexInternal::TryLock()
break;
case 0:
if (m_type == wxMUTEX_DEFAULT)
m_owningThread = wxThread::GetCurrentId();
return wxMUTEX_NO_ERROR;
default:
@@ -370,6 +387,8 @@ wxMutexError wxMutexInternal::TryLock()
wxMutexError wxMutexInternal::Unlock()
{
m_owningThread = 0;
int err = pthread_mutex_unlock(&m_mutex);
switch ( err )
{