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bug 601268 - Add canary-in-the-mine instrumentation to detect when the browser process spends too long outside its main-thread event loop(s) r=cjones a=beltzner

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This commit is contained in:
Brad Lassey 2010-10-27 11:16:03 -04:00
parent 5181dfd7f7
commit 04b1298636
1 changed files with 62 additions and 0 deletions
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62
xpcom/threads/nsThread.cpp
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@ -46,6 +46,20 @@
#include "prlog.h"
#include "nsThreadUtilsInternal.h"
#define HAVE_UALARM _BSD_SOURCE || (_XOPEN_SOURCE >= 500 || \
_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED) && \
!(_POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 700)
#if defined(XP_UNIX) && !defined(ANDROID) && !defined(DEBUG) && HAVE_UALARM \
&& defined(_GNU_SOURCE)
# define MOZ_CANARY
# include <unistd.h>
# include <execinfo.h>
# include <signal.h>
# include <fcntl.h>
# include "nsXULAppAPI.h"
#endif
#include "mozilla/FunctionTimer.h"
#if defined(NS_FUNCTION_TIMER) && defined(_MSC_VER)
#include "nsTimerImpl.h"
@ -500,6 +514,51 @@ nsThread::HasPendingEvents(PRBool *result)
return NS_OK;
}
#ifdef MOZ_CANARY
void canary_alarm_handler (int signum);
class Canary {
//XXX ToDo: support nested loops
public:
Canary() {
if (sOutputFD != 0 && NS_IsMainThread() &&
XRE_GetProcessType() == GeckoProcessType_Default) {
if (sOutputFD == -1) {
const int flags = O_WRONLY | O_APPEND | O_CREAT | O_NONBLOCK;
const mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
char* env_var_flag = getenv("MOZ_KILL_CANARIES");
sOutputFD = env_var_flag ? (env_var_flag[0] ?
open(env_var_flag, flags, mode) :
STDERR_FILENO) : 0;
if (sOutputFD == 0)
return;
}
signal(SIGALRM, canary_alarm_handler);
ualarm(15000, 0);
}
}
~Canary() {
if (sOutputFD != 0 && NS_IsMainThread() &&
XRE_GetProcessType() == GeckoProcessType_Default)
ualarm(0, 0);
}
static int sOutputFD;
};
int Canary::sOutputFD = -1;
void canary_alarm_handler (int signum)
{
void *array[30];
const char msg[29] = "event took too long to run:\n";
// use write to be safe in the signal handler
write(Canary::sOutputFD, msg, sizeof(msg));
backtrace_symbols_fd(array, backtrace(array, 30), Canary::sOutputFD);
}
#endif
NS_IMETHODIMP
nsThread::ProcessNextEvent(PRBool mayWait, PRBool *result)
{
@ -518,6 +577,9 @@ nsThread::ProcessNextEvent(PRBool mayWait, PRBool *result)
++mRunningEvent;
#ifdef MOZ_CANARY
Canary canary;
#endif
nsresult rv = NS_OK;
{