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Fixed a possible crash in cStateLockLog

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This commit is contained in:
Klaus Schmidinger
2017-06-23 09:03:19 +02:00
parent 1bce499383
commit 56117751a8
2 changed files with 28 additions and 7 deletions
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3
HISTORY
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@@ -9130,7 +9130,7 @@ Video Disk Recorder Revision History
before including tools.h in case some plugin needs to use the STL and gets error
messages regarding one of the template functions defined in tools.h.
2017-06-19: Version 2.3.8
2017-06-23: Version 2.3.8
- Updated links in the INSTALL file (thanks to Chris Mayo).
- Fixed detecting whether a CAM replies to queries, which didn't work on some systems
@@ -9138,3 +9138,4 @@ Video Disk Recorder Revision History
- Added some missing locks when calling functions from cStatus or cSkin*, and added
some text to status.h and skins.h, explaining the locking situation when such
functions are called.
- Fixed a possible crash in cStateLockLog.

32
thread.c
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@@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: thread.c 4.9 2017/06/09 08:27:22 kls Exp $
* $Id: thread.c 4.10 2017/06/22 15:10:42 kls Exp $
*/
#include "thread.h"
@@ -558,6 +558,7 @@ cString cBackTrace::GetCaller(int Level, bool Mangled)
#ifdef DEBUG_LOCKSEQ
#define SLL_SIZE 20 // the number of log entries
#define SLL_LENGTH 512 // the maximum length of log entries
#define SLL_THREADS 20 // the maximum number of threads holding locks at the same time (typically well below 10)
#define SLL_MAX_LIST 9 // max. number of lists to log
#define SLL_WRITE_FLAG 0x80000000
#define SLL_LOCK_FLAG 0x40000000
@@ -569,7 +570,7 @@ private:
cVector<int> flags;
tThreadId logThreadIds[SLL_SIZE];
int logFlags[SLL_SIZE];
uint8_t logCounter[SLL_SIZE][SLL_MAX_LIST];
uint8_t logCounter[SLL_THREADS][SLL_MAX_LIST];
#ifdef DEBUG_LOCKCALL
char logCaller[SLL_SIZE][SLL_LENGTH];
#endif
@@ -644,15 +645,32 @@ void cStateLockLog::Check(const char *Name, bool Lock, bool Write)
int b = 1 << n;
cMutexLock MutexLock(&mutex);
tThreadId ThreadId = cThread::ThreadId();
int Index = threadIds.IndexOf(ThreadId);
int Index = -1;
int AvailableIndex = -1;
for (int i = 0; i < threadIds.Size(); i++) {
if (ThreadId == threadIds[i]) {
Index = i;
break;
}
if (threadIds[i] == 0)
AvailableIndex = i;
}
if (Index < 0) {
if (Lock) {
if (AvailableIndex < 0) {
Index = threadIds.Size();
threadIds.Append(ThreadId);
flags.Append(0);
}
else
return;
else {
Index = AvailableIndex;
threadIds[Index] = ThreadId;
}
}
if (Index >= SLL_THREADS) {
// should never happen!
esyslog("ERROR: too many threads holding list locks at the same time - stopped logging locks!");
dumped = true;
return;
}
bool DoDump = false;
if (Lock) {
@@ -667,6 +685,8 @@ void cStateLockLog::Check(const char *Name, bool Lock, bool Write)
flags[Index] &= ~b;
logThreadIds[logIndex] = ThreadId;
logFlags[logIndex] = flags[Index] | (Write ? SLL_WRITE_FLAG : 0) | (Lock ? SLL_LOCK_FLAG : 0);
if (flags[Index] == 0)
threadIds[Index] = 0;
#ifdef DEBUG_LOCKCALL
strn0cpy(logCaller[logIndex], cBackTrace::GetCaller(Lock ? 3 : 5, true), SLL_LENGTH);
#endif