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This GDB was configured as "arm-hisiv200-linux"...
warning: exec file is newer than core file.
Reading symbols from /lib/libpthread.so.0...done.
Loaded symbols for /lib/libpthread.so.0
Reading symbols from /lib/libncurses.so.5...done.
Loaded symbols for /lib/libncurses.so.5
Reading symbols from /lib/libstdc++.so.6...done.
Loaded symbols for /lib/libstdc++.so.6
Reading symbols from /lib/libm.so.6...done.
Loaded symbols for /lib/libm.so.6
Reading symbols from /lib/libgcc_s.so.1...done.
Loaded symbols for /lib/libgcc_s.so.1
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.3...done.
Loaded symbols for /lib/ld-linux.so.3
Core was generated by `./communicate -d/dev/ttyAMA1'.
Program terminated with signal 6, Aborted.
[New process 4216]
[New process 4215]
[New process 1654]
[New process 1655]
#0 0x2ad82678 in *__GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:67
67 ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
in ../nptl/sysdeps/unix/sysv/linux/raise.c
(gdb) backtrace
#0 0x2ad82678 in *__GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:67
#1 0x2ad881ec in *__GI_abort () at abort.c:92
#2 0x2acb6294 in __gnu_cxx::__verbose_terminate_handler () at ../../../../../gcc-4.4-2010q1/libstdc++-v3/libsupc++/vterminate.cc:93
#3 0x2acb3a4c in __cxxabiv1::__terminate (handler=0) at ../../../../../gcc-4.4-2010q1/libstdc++-v3/libsupc++/eh_terminate.cc:38
#4 0x2acb3a74 in std::terminate () at ../../../../../gcc-4.4-2010q1/libstdc++-v3/libsupc++/eh_terminate.cc:48
#5 0x2acb39e4 in __gxx_personality_v0 (state=<value optimized out>, ue_header=0x2bf8c6a8, context=0x2bf8b508) at ../../../../../gcc-4.4-2010q1/libstdc++-v3/libsupc++/eh_personality.cc:675
#6 0x2ab49a68 in unwind_phase2_forced (ucbp=0x2bf8c6a8, entry_vrs=<value optimized out>, resuming=<value optimized out>)
at ../../../../gcc-4.4-2010q1/libgcc/../gcc/config/arm/unwind-arm.c:747
#7 0x2ab4a8b8 in ___Unwind_ForcedUnwind () at ../../../../gcc-4.4-2010q1/libgcc/../gcc/config/arm/libunwind.S:332
#8 0x2aba0410 in _Unwind_ForcedUnwind (exc=0x2bf8c6a8, stop=0x2ab9d8b0 <unwind_stop>, stop_argument=0x2bf8bde0) at ../ports/sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind-forcedunwind.c:149
#9 0x2ab9d864 in *__GI___pthread_unwind (buf=0x2bf8bde0) at unwind.c:130
#10 0x2ab9349c in sigcancel_handler (sig=<value optimized out>, si=<value optimized out>, ctx=<value optimized out>) at ../nptl/pthreadP.h:265
#11 <signal handler called>
#12 0x0002e1a8 in timer_fnc (arg=0x2b69cd28) at /root/hisi/communicate/srcs/libctb-0.16/src/linux/timer.cpp:32
#13 0x2ab94a8c in start_thread (arg=<value optimized out>) at pthread_create.c:302
#14 0x2ae32388 in clone () from /lib/libc.so.6
2 个解决方案
#1
timer_fnc里调用了cancel例程？里面发生了异常？
#2
版主说的很对，程序中不使用这个timer 就没有问题，这是开源库ctb-0.16里的代码，可以看出什么问题吗？
namespace ctb {
// a dummy function, see below
static void timer_exit(void* arg)
{
};
static void* timer_fnc(void* arg)
{
// the timer thread should be canceled every time
// (asyncronously)
pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS,NULL);
// this is tricky, but absolutly necessarily to avoid segfaults
// if the destructor finished a running thread
pthread_cleanup_push(timer_exit,NULL);
timer_control *tc = (timer_control*)arg;
// linux allows a real sleep, means the timer thread will
// be sleeping (no reduce of the system performance)
usleep(tc->usecs);
// time is over, system reawake the thread.
// if there is an exit function, calling it
if(tc->exitfnc) tc->exitfnc(NULL);
// set the exit flag
if(tc->exitflag) *tc->exitflag = 1;
// deallocate the system resources (thread)
pthread_cleanup_pop(1);
return NULL;
};
// the constructor initiate the internal control struct
Timer::Timer( unsigned int msecs, int* exitflag, void*( *exitfnc )(void*) )
{
control.usecs = msecs * 1000;
control.exitflag = exitflag;
control.exitfnc = exitfnc;
stopped = 1;
};
// if a timer instance leave it's valid range, it automaticaly will
// be finished
Timer::~Timer()
{
if(!stopped) {
// only a running thread may be canceled
stop();
}
};
// starts the timer thread
int Timer::start()
{
stopped = 0;
if(pthread_create(&tid, // result parameter, covers the id
// of the new threads
NULL, // thread attribute object, NULL means
// the defaults
timer_fnc, // start function of the thread
&control // start function parameter, must refer
// as void*
) == -1) {
return -1; // there was something going wrong
}
pthread_detach(tid); // thread status must be "detach". In the other
// case, the destructor call of a running
// thread throws a segfault
return 0;
};
// stop the timer thread
int Timer::stop()
{
if(control.exitflag && (*control.exitflag == 0)) {
pthread_cancel(tid);
}
stopped = 1;
return 0;
};
void sleepms(unsigned int ms)
{
usleep(ms * 1000);
};
} // namespace ctb
主程序是生成一个自己的pthread，一直调用ctb库的Writev，这个Writev使用了上面的定时器，不调用Writv就不会崩，调用会跑一段时间后（几十分钟到2小时之间）就会崩。
int IOBase::Writev(char* buf,size_t len,unsigned int timeout_in_ms)
{
char *cp = buf;
int n = 0;
int timeout = 0;
size_t towrite = len;
Timer t(timeout_in_ms,&timeout,NULL);
if(timeout_in_ms != 0xFFFFFFFF) {
t.start();
}
while(!timeout && (towrite > 0)) {
if((n = Write(cp,towrite)) < 0) {
// an error occurs
break;
}
if(!n) {
sleepms(1);
}
towrite -= n;
cp += n;
}
return (len - towrite);
};
#1
timer_fnc里调用了cancel例程？里面发生了异常？
#2
版主说的很对，程序中不使用这个timer 就没有问题，这是开源库ctb-0.16里的代码，可以看出什么问题吗？
namespace ctb {
// a dummy function, see below
static void timer_exit(void* arg)
{
};
static void* timer_fnc(void* arg)
{
// the timer thread should be canceled every time
// (asyncronously)
pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS,NULL);
// this is tricky, but absolutly necessarily to avoid segfaults
// if the destructor finished a running thread
pthread_cleanup_push(timer_exit,NULL);
timer_control *tc = (timer_control*)arg;
// linux allows a real sleep, means the timer thread will
// be sleeping (no reduce of the system performance)
usleep(tc->usecs);
// time is over, system reawake the thread.
// if there is an exit function, calling it
if(tc->exitfnc) tc->exitfnc(NULL);
// set the exit flag
if(tc->exitflag) *tc->exitflag = 1;
// deallocate the system resources (thread)
pthread_cleanup_pop(1);
return NULL;
};
// the constructor initiate the internal control struct
Timer::Timer( unsigned int msecs, int* exitflag, void*( *exitfnc )(void*) )
{
control.usecs = msecs * 1000;
control.exitflag = exitflag;
control.exitfnc = exitfnc;
stopped = 1;
};
// if a timer instance leave it's valid range, it automaticaly will
// be finished
Timer::~Timer()
{
if(!stopped) {
// only a running thread may be canceled
stop();
}
};
// starts the timer thread
int Timer::start()
{
stopped = 0;
if(pthread_create(&tid, // result parameter, covers the id
// of the new threads
NULL, // thread attribute object, NULL means
// the defaults
timer_fnc, // start function of the thread
&control // start function parameter, must refer
// as void*
) == -1) {
return -1; // there was something going wrong
}
pthread_detach(tid); // thread status must be "detach". In the other
// case, the destructor call of a running
// thread throws a segfault
return 0;
};
// stop the timer thread
int Timer::stop()
{
if(control.exitflag && (*control.exitflag == 0)) {
pthread_cancel(tid);
}
stopped = 1;
return 0;
};
void sleepms(unsigned int ms)
{
usleep(ms * 1000);
};
} // namespace ctb
主程序是生成一个自己的pthread，一直调用ctb库的Writev，这个Writev使用了上面的定时器，不调用Writv就不会崩，调用会跑一段时间后（几十分钟到2小时之间）就会崩。
int IOBase::Writev(char* buf,size_t len,unsigned int timeout_in_ms)
{
char *cp = buf;
int n = 0;
int timeout = 0;
size_t towrite = len;
Timer t(timeout_in_ms,&timeout,NULL);
if(timeout_in_ms != 0xFFFFFFFF) {
t.start();
}
while(!timeout && (towrite > 0)) {
if((n = Write(cp,towrite)) < 0) {
// an error occurs
break;
}
if(!n) {
sleepms(1);
}
towrite -= n;
cp += n;
}
return (len - towrite);
};