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-rw-r--r--debug.c197
1 files changed, 164 insertions, 33 deletions
diff --git a/debug.c b/debug.c
index f21320b1..1ccb3d60 100644
--- a/debug.c
+++ b/debug.c
@@ -52,9 +52,11 @@ int Debug; /* debug flag - read-only after startup */
int debugging_on = 0; /* read-only, except on sig USR1 */
static int bLogFuncFlow = 0; /* shall the function entry and exit be logged to the debug log? */
static int bPrintFuncDBOnExit = 0; /* shall the function entry and exit be logged to the debug log? */
-
+static char *pszAltDbgFileName = "/home/rger/proj/rsyslog/log"; /* if set, debug output is *also* sent to here */
+static FILE *altdbg; /* and the handle for alternate debug output */
static FILE *stddbg;
+
/* list of all known FuncDBs. We use a special list, because it must only be single-linked. As
* functions never disappear, we only need to add elements when we see a new one and never need
* to remove anything. For this, we simply add at the top, which saves us a Last pointer. The goal
@@ -143,6 +145,8 @@ static void dbgMutexCancelCleanupHdlr(void *pmut)
/* ------------------------- FuncDB utility functions ------------------------- */
+#define SIZE_FUNCDB_MUTEX_TABLE(pFuncDB) ((int) (sizeof(pFuncDB->mutInfo) / sizeof(dbgFuncDBmutInfoEntry_t)))
+
/* print a FuncDB
*/
static void dbgFuncDBPrint(dbgFuncDB_t *pFuncDB)
@@ -169,6 +173,96 @@ static void dbgFuncDBPrintAll(void)
dbgprintf("%d unique functions called\n", nFuncs);
}
+
+/* find a mutex inside the FuncDB mutex table. Returns NULL if not found. Only mutexes from the same thread
+ * are found.
+ */
+static inline dbgFuncDBmutInfoEntry_t *dbgFuncDBGetMutexInfo(dbgFuncDB_t *pFuncDB, pthread_mutex_t *pmut)
+{
+ int i;
+ int iFound = -1;
+ pthread_t ourThrd = pthread_self();
+
+ for(i = 0 ; i < SIZE_FUNCDB_MUTEX_TABLE(pFuncDB) ; ++i) {
+ if(pFuncDB->mutInfo[i].pmut == pmut && pFuncDB->mutInfo[i].lockLn != -1 && pFuncDB->mutInfo[i].thrd == ourThrd) {
+ iFound = i;
+ break;
+ }
+ }
+
+ return (iFound == -1) ? NULL : &pFuncDB->mutInfo[i];
+}
+
+
+/* print any mutex that can be found in the FuncDB. Custom header is provided.
+ * "thrd" is the thread that is searched. If it is 0, mutexes for all threads
+ * shall be printed.
+ */
+static inline void
+dbgFuncDBPrintActiveMutexes(dbgFuncDB_t *pFuncDB, char *pszHdrText, pthread_t thrd)
+{
+ int i;
+ char pszThrdName[64];
+
+ for(i = 0 ; i < SIZE_FUNCDB_MUTEX_TABLE(pFuncDB) ; ++i) {
+ if(pFuncDB->mutInfo[i].lockLn != -1 && (thrd == 0 || thrd == pFuncDB->mutInfo[i].thrd)) {
+ dbgGetThrdName(pszThrdName, sizeof(pszThrdName), pFuncDB->mutInfo[i].thrd, 1);
+ dbgprintf("%s:%d:%s:invocation %ld: %s %p[%d/%s]\n", pFuncDB->file, pFuncDB->line, pFuncDB->func,
+ pFuncDB->mutInfo[i].lInvocation, pszHdrText, (void*)pFuncDB->mutInfo[i].pmut, i,
+ pszThrdName);
+ }
+ }
+}
+
+/* find a free mutex info spot in FuncDB. NULL is returned if table is full.
+ */
+static inline dbgFuncDBmutInfoEntry_t *dbgFuncDBFindFreeMutexInfo(dbgFuncDB_t *pFuncDB)
+{
+ int i;
+ int iFound = -1;
+
+ for(i = 0 ; i < SIZE_FUNCDB_MUTEX_TABLE(pFuncDB) ; ++i) {
+ if(pFuncDB->mutInfo[i].lockLn == -1) {
+ iFound = i;
+ break;
+ }
+ }
+
+ if(iFound == -1) {
+ dbgprintf("%s:%d:%s: INFO: out of space in FuncDB for mutex info (max %d entries) - ignoring\n",
+ pFuncDB->file, pFuncDB->line, pFuncDB->func, SIZE_FUNCDB_MUTEX_TABLE(pFuncDB));
+ }
+
+ return (iFound == -1) ? NULL : &pFuncDB->mutInfo[i];
+}
+
+/* add a mutex lock to the FuncDB. If the size is exhausted, info is discarded.
+ */
+static inline void dbgFuncDBAddMutexLock(dbgFuncDB_t *pFuncDB, pthread_mutex_t *pmut, int lockLn)
+{
+ dbgFuncDBmutInfoEntry_t *pMutInfo;
+
+ if((pMutInfo = dbgFuncDBFindFreeMutexInfo(pFuncDB)) != NULL) {
+ pMutInfo->pmut = pmut;
+ pMutInfo->lockLn = lockLn;
+ pMutInfo->lInvocation = pFuncDB->nTimesCalled;
+ pMutInfo->thrd = pthread_self();
+ }
+}
+
+/* remove a locked mutex from the FuncDB (unlock case!).
+ */
+static inline void dbgFuncDBRemoveMutexLock(dbgFuncDB_t *pFuncDB, pthread_mutex_t *pmut)
+{
+ dbgFuncDBmutInfoEntry_t *pMutInfo;
+
+ if((pMutInfo = dbgFuncDBGetMutexInfo(pFuncDB, pmut)) != NULL) {
+ pMutInfo->lockLn = -1;
+ }
+//dbgprintf("dbgFuncDB mutex to be removed %p, ptr found %p, lockLn %d\n", pmut, pMutInfo, (pMutInfo == 0) ? 123456789 : pMutInfo->lockLn);
+}
+
+
/* ------------------------- END FuncDB utility functions ------------------------- */
/* ###########################################################################
@@ -264,7 +358,6 @@ dbgMutLog_t *dbgMutLogFindSpecific(pthread_mutex_t *pmut, short mutop, dbgFuncDB
pLog = dbgMutLogListLast;
while(pLog != NULL) {
-
if( pLog->mut == pmut && pLog->thrd == mythrd && pLog->mutexOp == mutop
&& (pFuncDB == NULL || pLog->pFuncDB == pFuncDB))
break;
@@ -289,8 +382,6 @@ dbgMutLog_t *dbgMutLogFindFromBack(pthread_mutex_t *pmut, dbgMutLog_t *pLast)
if(pLog->mut == pmut) {
break;
}
-//RUNLOG_VAR("%p", pLog);
-//RUNLOG_VAR("%p", pLog->pPrev);
pLog = pLog->pPrev;
}
@@ -307,8 +398,6 @@ dbgMutLog_t *dbgMutLogFindHolder(pthread_mutex_t *pmut)
while(pLog != NULL) {
if(pLog->mutexOp == MUTOP_LOCK)
break;
-//RUNLOG_VAR("%p", pLog);
-//RUNLOG_VAR("%p", pLog->pPrev);
pLog = dbgMutLogFindFromBack(pmut, pLog);
}
@@ -316,7 +405,7 @@ dbgMutLog_t *dbgMutLogFindHolder(pthread_mutex_t *pmut)
}
/* report wait on a mutex and add it to the mutex log */
-static inline void dbgMutexPreLockLog(pthread_mutex_t *pmut, dbgFuncDB_t *pFuncDB)
+static inline void dbgMutexPreLockLog(pthread_mutex_t *pmut, dbgFuncDB_t *pFuncDB, int ln)
{
dbgMutLog_t *pHolder;
dbgMutLog_t *pLog;
@@ -324,15 +413,10 @@ static inline void dbgMutexPreLockLog(pthread_mutex_t *pmut, dbgFuncDB_t *pFuncD
char pszHolderThrdName[64];
char *pszHolder;
-//RUNLOG;
pthread_mutex_lock(&mutMutLog);
-//dbgprintf("dbgMutexPreLockLog mutMutLog aquired\n");
-//RUNLOG;
pHolder = dbgMutLogFindHolder(pmut);
-//RUNLOG;
pLog = dbgMutLogAddEntry(pmut, MUTOP_LOCKWAIT, pFuncDB);
-//RUNLOG;
if(pHolder == NULL)
pszHolder = "[NONE]";
else {
@@ -341,82 +425,103 @@ static inline void dbgMutexPreLockLog(pthread_mutex_t *pmut, dbgFuncDB_t *pFuncD
pszHolder = pszBuf;
}
- dbgprintf("%s:%d:%s: mutex %p waiting on lock, held by %s\n", pFuncDB->file, pFuncDB->line, pFuncDB->func, (void*)pmut, pszHolder);
+ dbgprintf("%s:%d:%s: mutex %p waiting on lock, held by %s\n", pFuncDB->file, ln, pFuncDB->func, (void*)pmut, pszHolder);
pthread_mutex_unlock(&mutMutLog);
}
/* report aquired mutex */
-static inline void dbgMutexLockLog(pthread_mutex_t *pmut, dbgFuncDB_t *pFuncDB)
+static inline void dbgMutexLockLog(pthread_mutex_t *pmut, dbgFuncDB_t *pFuncDB, int lockLn)
{
dbgMutLog_t *pLog;
pthread_mutex_lock(&mutMutLog);
+
+ /* find and delete "waiting" entry */
pLog = dbgMutLogFindSpecific(pmut, MUTOP_LOCKWAIT, pFuncDB);
assert(pLog != NULL);
dbgMutLogDelEntry(pLog);
+
+ /* add "lock" entry */
pLog = dbgMutLogAddEntry(pmut, MUTOP_LOCK, pFuncDB);
+ dbgFuncDBAddMutexLock(pFuncDB, pmut, lockLn);
pthread_mutex_unlock(&mutMutLog);
- dbgprintf("%s:%d:%s: mutex %p aquired\n", pFuncDB->file, pFuncDB->line, pFuncDB->func, (void*)pmut);
+ dbgprintf("%s:%d:%s: mutex %p aquired\n", pFuncDB->file, lockLn, pFuncDB->func, (void*)pmut);
}
/* if we unlock, we just remove the lock aquired entry from the log list */
-static inline void dbgMutexUnlockLog(pthread_mutex_t *pmut, dbgFuncDB_t *pFuncDB)
+static inline void dbgMutexUnlockLog(pthread_mutex_t *pmut, dbgFuncDB_t *pFuncDB, int unlockLn)
{
dbgMutLog_t *pLog;
pthread_mutex_lock(&mutMutLog);
pLog = dbgMutLogFindSpecific(pmut, MUTOP_LOCK, NULL);
assert(pLog != NULL);
+
+ /* we found the last lock entry. We now need to see from which FuncDB we need to
+ * remove it. This is recorded inside the mutex log entry.
+ */
+ dbgFuncDBRemoveMutexLock(pLog->pFuncDB, pmut);
+
+ /* donw with the log entry, get rid of it... */
dbgMutLogDelEntry(pLog);
+
pthread_mutex_unlock(&mutMutLog);
- dbgprintf("%s:%d:%s: mutex %p UNlocked\n", pFuncDB->file, pFuncDB->line, pFuncDB->func, (void*)pmut);
+ dbgprintf("%s:%d:%s: mutex %p UNlocked\n", pFuncDB->file, unlockLn, pFuncDB->func, (void*)pmut);
}
-int dbgMutexLock(pthread_mutex_t *pmut, dbgFuncDB_t *pFuncDB)
+/* wrapper for pthread_mutex_lock() */
+int dbgMutexLock(pthread_mutex_t *pmut, dbgFuncDB_t *pFuncDB, int ln)
{
int ret;
- dbgMutexPreLockLog(pmut, pFuncDB);
+ dbgMutexPreLockLog(pmut, pFuncDB, ln);
ret = pthread_mutex_lock(pmut);
+ if(ret == 0) {
+ dbgMutexLockLog(pmut, pFuncDB, ln);
+ } else {
+ dbgprintf("%s:%d:%s: ERROR: pthread_mutex_lock() for mutex %p failed with error %d (%s)\n",
+ pFuncDB->file, ln, pFuncDB->func, (void*)pmut, ret, strerror(errno)); // TODO: remove strerror!"!!
+ }
- dbgMutexLockLog(pmut, pFuncDB);
return ret;
}
-int dbgMutexUnlock(pthread_mutex_t *pmut, dbgFuncDB_t *pFuncDB)
+/* wrapper for pthread_mutex_unlock() */
+int dbgMutexUnlock(pthread_mutex_t *pmut, dbgFuncDB_t *pFuncDB, int ln)
{
int ret;
- dbgMutexUnlockLog(pmut, pFuncDB);
+ dbgMutexUnlockLog(pmut, pFuncDB, ln);
ret = pthread_mutex_unlock(pmut);
return ret;
}
-int dbgCondWait(pthread_cond_t *cond, pthread_mutex_t *pmut, dbgFuncDB_t *pFuncDB)
+/* wrapper for pthread_cond_wait() */
+int dbgCondWait(pthread_cond_t *cond, pthread_mutex_t *pmut, dbgFuncDB_t *pFuncDB, int ln)
{
int ret;
- dbgMutexUnlockLog(pmut, pFuncDB);
+ dbgMutexUnlockLog(pmut, pFuncDB, ln);
dbgprintf("%s:%d:%s: mutex %p waiting on condition %p\n", pFuncDB->file, pFuncDB->line, pFuncDB->func, (void*)pmut, (void*)cond);
- dbgMutexPreLockLog(pmut, pFuncDB);
+ dbgMutexPreLockLog(pmut, pFuncDB, ln);
ret = pthread_cond_wait(cond, pmut);
- dbgMutexLockLog(pmut, pFuncDB);
return ret;
}
-int dbgCondTimedWait(pthread_cond_t *cond, pthread_mutex_t *pmut, const struct timespec *abstime, dbgFuncDB_t *pFuncDB)
+/* wrapper for pthread_cond_timedwait() */
+int dbgCondTimedWait(pthread_cond_t *cond, pthread_mutex_t *pmut, const struct timespec *abstime, dbgFuncDB_t *pFuncDB, int ln)
{
int ret;
- dbgMutexUnlockLog(pmut, pFuncDB);
- dbgMutexPreLockLog(pmut, pFuncDB);
+ dbgMutexUnlockLog(pmut, pFuncDB, ln);
+ dbgMutexPreLockLog(pmut, pFuncDB, ln);
dbgprintf("%s:%d:%s: mutex %p waiting on condition %p (with timeout)\n", pFuncDB->file, pFuncDB->line, pFuncDB->func,
(void*)pmut, (void*)cond);
ret = pthread_cond_timedwait(cond, pmut, abstime);
RUNLOG;
- dbgMutexLockLog(pmut, pFuncDB);
+ dbgMutexLockLog(pmut, pFuncDB, ln);
return ret;
}
@@ -583,6 +688,8 @@ dbgprintf(char *fmt, ...)
static int bWasNL = 0;
va_list ap;
static char pszThrdName[64]; /* 64 is to be on the safe side, anything over 20 is bad... */
+ static char pszWriteBuf[1024];
+ size_t lenWriteBuf;
if(!(Debug && debugging_on))
return;
@@ -603,6 +710,7 @@ dbgprintf(char *fmt, ...)
if(ptLastThrdID != pthread_self()) {
if(!bWasNL) {
fprintf(stddbg, "\n");
+ if(altdbg != NULL) fprintf(altdbg, "\n");
bWasNL = 1;
}
ptLastThrdID = pthread_self();
@@ -615,13 +723,25 @@ dbgprintf(char *fmt, ...)
if(bWasNL) {
fprintf(stddbg, "%s: ", pszThrdName);
+ if(altdbg != NULL) fprintf(altdbg, "%s: ", pszThrdName);
}
bWasNL = (*(fmt + strlen(fmt) - 1) == '\n') ? 1 : 0;
va_start(ap, fmt);
- vfprintf(stddbg, fmt, ap);
+ lenWriteBuf = vsnprintf(pszWriteBuf, sizeof(pszWriteBuf), fmt, ap);
+ if(lenWriteBuf >= sizeof(pszWriteBuf)) {
+ /* if our buffer was too small, we simply truncate. TODO: maybe something better? */
+ lenWriteBuf--;
+ }
va_end(ap);
+ /*
+ fprintf(stddbg, "%s", pszWriteBuf);
+ if(altdbg != NULL) fprintf(altdbg, "%s", pszWriteBuf);
+ */
+ fwrite(pszWriteBuf, lenWriteBuf, 1, stddbg);
+ fwrite(pszWriteBuf, lenWriteBuf, 1, altdbg);
fflush(stddbg);
+ fflush(altdbg);
pthread_cleanup_pop(1);
}
@@ -644,11 +764,12 @@ int dbgEntrFunc(dbgFuncDB_t *pFuncDB)
assert(pFuncDB->magic == dbgFUNCDB_MAGIC);
if(pFuncDB->nTimesCalled++ == 0) {
+ /* dbgprintf("%s:%d:%s: called first time, initializing FuncDB\n", pFuncDB->file, pFuncDB->line, pFuncDB->func); */
/* this is the first time we see this function, so let's fully initialize the FuncDB. Note
* that partial initialization already occured via the initializer, as far as this could be
* done (all static values have been set).
*/
- for(i = 1 ; i < sizeof(pFuncDB->mutInfo)/sizeof(dbgFuncDBmutInfoEntry_t) ; ++i) {
+ for(i = 0 ; i < sizeof(pFuncDB->mutInfo)/sizeof(dbgFuncDBmutInfoEntry_t) ; ++i) {
pFuncDB->mutInfo[i].lockLn = -1; /* set to not Locked */
}
/* finally add element to list of FuncDBs */
@@ -668,7 +789,7 @@ int dbgEntrFunc(dbgFuncDB_t *pFuncDB)
if(bLogFuncFlow)
dbgprintf("%s:%d: %s: enter\n", pFuncDB->file, pFuncDB->line, pFuncDB->func);
- if(pThrd->stackPtr >= (int) (sizeof(pThrd->callStack) / sizeof(dbgFuncDB_t))) {
+ if(pThrd->stackPtr >= (int) (sizeof(pThrd->callStack) / sizeof(dbgFuncDB_t*))) {
dbgprintf("%s:%d: %s: debug module: call stack for this thread full, suspending call tracking\n",
pFuncDB->file, pFuncDB->line, pFuncDB->func);
iStackPtr = pThrd->stackPtr;
@@ -693,6 +814,7 @@ void dbgExitFunc(dbgFuncDB_t *pFuncDB, int iStackPtrRestore)
assert(pFuncDB != NULL);
assert(pFuncDB->magic == dbgFUNCDB_MAGIC);
+ dbgFuncDBPrintActiveMutexes(pFuncDB, "WARNING: mutex still owned by us as we exit function, mutex: ", pthread_self());
if(bLogFuncFlow)
dbgprintf("%s:%d: %s: exit\n", pFuncDB->file, pFuncDB->line, pFuncDB->func);
pThrd->stackPtr = iStackPtrRestore;
@@ -733,6 +855,13 @@ rsRetVal dbgClassInit(void)
sigaction(SIGUSR1, &sigAct, NULL);
stddbg = stdout;
+ if(pszAltDbgFileName != NULL) {
+ /* we have a secondary file, so let's open it) */
+ if((altdbg = fopen(pszAltDbgFileName, "w")) == NULL) {
+ fprintf(stderr, "alternate debug file could not be opened, ignoring. Error: %s\n", strerror(errno));
+ }
+ }
+
dbgSetThrdName((uchar*)"main thread");
return RS_RET_OK;
}
@@ -741,6 +870,8 @@ rsRetVal dbgClassInit(void)
rsRetVal dbgClassExit(void)
{
pthread_key_delete(keyCallStack);
+ if(altdbg != NULL)
+ fclose(altdbg);
return RS_RET_OK;
}
/*
generated by cgit (git 2.34.1) at 2024-11-18 20:55:51 +0000