linux多线程应用程序中的中断会生成SIGSEGV
Interruption in a linux multithreaded app generate SIGSEGV
我有一个x86_64多线程应用程序，我试图模拟avr中断:当中断发生时，应用程序和所有线程被挂起，而中断处理程序执行定义的动作。
我认为信号是解决这个问题的办法，所以我试图捕捉SIGUSR1信号，但是当我在执行应用函数之前用分段错误引发SIGUSR1程序退出时。(我在isr和信号中尝试过互斥锁，但实际上它们在主线程中运行时被删除)
代码在5个文件内。
isr.h
#ifndef __ISR_H__
#define __ISR_H__
typedef void (*routine_t)(void);
class InterruptServiceRoutine
{
routine_t routine;
bool locked = true;
public:
InterruptServiceRoutine(routine_t isr);
void apply();
void unlock(){locked = false;};
};
typedef InterruptServiceRoutine ISR_t;
#endif // __ISR_H__
isr.cpp:
#include <ISR.h>
InterruptServiceRoutine::InterruptServiceRoutine(routine_t isr): routine(isr){}
void InterruptServiceRoutine::apply()
{
if (!locked) routine();
}
Signals.h:
#ifndef __SIGNALS_H__
#define __SIGNALS_H__
#include <vector>
#include <ISR.h>
#include <signal.h>
class Logger;
class Signals
{
private:
Logger& log;
std::vector<ISR_t*> isr_table;
public:
Signals(Logger&);
~Signals();
unsigned int count(void);
void clear(void);
void connect(ISR_t &isr);
void apply(int);
};
#endif // __SIGNALS_H__
Signals.cpp:
#include <signal.h>
#include <pthread.h>
#include <functional>
#include <ISR.h>
#include <Signals.h>
#include <Logger.h>
using namespace std;
void Signals::apply(int)
{
sigset_t sigs_to_block;
sigfillset(&sigs_to_block);
pthread_sigmask(SIG_BLOCK, &sigs_to_block, NULL);
unsigned int num_interrupts = count();
for (unsigned int i=0; i < num_interrupts; ++i)
{
isr_table[i]->apply();
}
pthread_sigmask(SIG_SETMASK, NULL, NULL);
}
Signals::Signals(Logger& _log): log(_log)
{
clear();
auto _apply = bind1st(mem_fun(&Signals::apply), this);
struct sigaction new_action;
new_action.sa_handler = (__sighandler_t) &_apply;
new_action.sa_flags = 0;
sigfillset(&new_action.sa_mask);
sigaction(SIGUSR1, &new_action, NULL);
pthread_sigmask(SIG_SETMASK, NULL, NULL);
}
Signals::~Signals() {
struct sigaction new_action;
new_action.sa_handler = SIG_DFL;
new_action.sa_flags = 0;
sigemptyset(&new_action.sa_mask);
sigaddset(&new_action.sa_mask, SIGUSR1);
sigaction(SIGUSR1, &new_action, NULL);
clear();
}
void Signals::clear(void)
{
isr_table.clear();
isr_table.reserve(20);
}
unsigned int Signals::count(void)
{
return isr_table.size();
}
void Signals::connect(ISR_t &isr)
{
isr_table.push_back(&isr);
}
SignalsTest.test:
#include <signal.h>
#include <pthread.h>
#include <cxxtest/TestSuite.h>
#include <ISR.h>
#include <Signals.h>
#include <Logger.h>
volatile sig_atomic_t isr_called_count;
void isr(void)
{
++isr_called_count;
}
class SignalsTestSuite: public CxxTest::TestSuite
{
Logger log;
Signals handler;
public:
SignalsTestSuite(void): handler(log){}
void setUp()
{
handler.clear();
isr_called_count = 0;
}
/* ... truncated for more visibility ... */
void testWhenRaiseSIGUSRItCallsAvailableRoutine(void)
{
ISR_t routine(&isr);
routine.unlock();
handler.connect(routine);
handler.connect(routine);
raise(SIGUSR1);
TS_ASSERT_EQUALS(isr_called_count, 2);
}
};
调试信息:
GNU gdb (Gentoo 7.7.1 p1) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://bugs.gentoo.org/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./out/signals...done.
(gdb) r
Starting program: test/out/signals
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Running 3 tests..
Program received signal SIGUSR1, User defined signal 1.
0x00007ffff7bd0beb in raise (sig=10) at ../sysdeps/unix/sysv/linux/pt-raise.c:36
36 return INLINE_SYSCALL (tgkill, 3, pid, THREAD_GETMEM (THREAD_SELF, tid),
(gdb) bt
#0 0x00007ffff7bd0beb in raise (sig=10) at ../sysdeps/unix/sysv/linux/pt-raise.c:36
#1 0x0000000000403f38 in SignalsTestSuite::testWhenRaiseSIGUSRItCallsAvailableRoutine (this=this@entry=0x631cc0 <suite_SignalsTestSuite>)
at test/SignalsTest.test:62
#2 0x0000000000403f92 in TestDescription_suite_SignalsTestSuite_testWhenRaiseSIGUSRItCallsAvailableRoutine::runTest (this=<optimized out>) at out/signals.cpp:38
#3 0x000000000040424e in CxxTest::RealTestDescription::run (this=<optimized out>) at /opt/cxxtest/cxxtest/RealDescriptions.cpp:109
#4 0x0000000000409afb in CxxTest::TestRunner::runTest (this=this@entry=0x7fffffffd29f, td=...) at /opt/cxxtest/cxxtest/TestRunner.h:85
#5 0x0000000000409c76 in CxxTest::TestRunner::runSuite (this=this@entry=0x7fffffffd29f, sd=...) at /opt/cxxtest/cxxtest/TestRunner.h:72
#6 0x0000000000409e15 in CxxTest::TestRunner::runWorld (this=this@entry=0x7fffffffd29f) at /opt/cxxtest/cxxtest/TestRunner.h:57
#7 0x0000000000409f52 in CxxTest::TestRunner::runAllTests (listener=...) at /opt/cxxtest/cxxtest/TestRunner.h:34
#8 0x0000000000409f93 in CxxTest::ErrorFormatter::run (this=this@entry=0x7fffffffd320) at /opt/cxxtest/cxxtest/ErrorFormatter.h:59
#9 0x000000000040aa89 in CxxTest::Main<CxxTest::ErrorPrinter> (tmp=..., argc=argc@entry=1, argv=argv@entry=0x7fffffffd448) at /opt/cxxtest/cxxtest/TestMain.h:109
#10 0x0000000000407f62 in main (argc=1, argv=0x7fffffffd448) at out/runner.cpp:18
(gdb) l
31 that. */
32 pid_t pid = THREAD_GETMEM (THREAD_SELF, pid);
33 if (__glibc_unlikely (pid < 0))
34 pid = -pid;
35
36 return INLINE_SYSCALL (tgkill, 3, pid, THREAD_GETMEM (THREAD_SELF, tid),
37 sig);
38 }
(gdb) s
Program received signal SIGSEGV, Segmentation fault.
0x00007fffffffd210 in ?? ()
(gdb) bt
#0 0x00007fffffffd210 in ?? ()
#1 <signal handler called>
#2 0x00007ffff7bd0beb in raise (sig=10) at ../sysdeps/unix/sysv/linux/pt-raise.c:36
#3 0x0000000000403f38 in SignalsTestSuite::testWhenRaiseSIGUSRItCallsAvailableRoutine (this=this@entry=0x631cc0 <suite_SignalsTestSuite>)
at test/SignalsTest.test:62
#4 0x0000000000403f92 in TestDescription_suite_SignalsTestSuite_testWhenRaiseSIGUSRItCallsAvailableRoutine::runTest (this=<optimized out>) at out/signals.cpp:38
#5 0x000000000040424e in CxxTest::RealTestDescription::run (this=<optimized out>) at /opt/cxxtest/cxxtest/RealDescriptions.cpp:109
#6 0x0000000000409afb in CxxTest::TestRunner::runTest (this=this@entry=0x7fffffffd29f, td=...) at /opt/cxxtest/cxxtest/TestRunner.h:85
#7 0x0000000000409c76 in CxxTest::TestRunner::runSuite (this=this@entry=0x7fffffffd29f, sd=...) at /opt/cxxtest/cxxtest/TestRunner.h:72
#8 0x0000000000409e15 in CxxTest::TestRunner::runWorld (this=this@entry=0x7fffffffd29f) at /opt/cxxtest/cxxtest/TestRunner.h:57
#9 0x0000000000409f52 in CxxTest::TestRunner::runAllTests (listener=...) at /opt/cxxtest/cxxtest/TestRunner.h:34
#10 0x0000000000409f93 in CxxTest::ErrorFormatter::run (this=this@entry=0x7fffffffd320) at /opt/cxxtest/cxxtest/ErrorFormatter.h:59
#11 0x000000000040aa89 in CxxTest::Main<CxxTest::ErrorPrinter> (tmp=..., argc=argc@entry=1, argv=argv@entry=0x7fffffffd448) at /opt/cxxtest/cxxtest/TestMain.h:109
#12 0x0000000000407f62 in main (argc=1, argv=0x7fffffffd448) at out/runner.cpp:18
(gdb) l
Line number 39 out of range; ../sysdeps/unix/sysv/linux/pt-raise.c has 38 lines.
(gdb) s
Cannot find bounds of current function
(gdb) c
Continuing.
Program terminated with signal SIGSEGV, Segmentation fault.
The program no longer exists.
内存信息:
$ valgrind --leak-check=full --show-leak-kinds=all ./out/signals
==31715== Memcheck, a memory error detector
==31715== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==31715== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info
==31715== Command: ./out/signals
==31715==
Running 3 tests..==31715==
==31715== Process terminating with default action of signal 11 (SIGSEGV)
==31715== Bad permissions for mapped region at address 0xFFEFFF1F0
==31715== at 0xFFEFFF1F0: ???
==31715== by 0x409F92FF: ???
==31715== by 0xFFF: ???
==31715== by 0x40AA88FF: ???
==31715==
==31715== HEAP SUMMARY:
==31715== in use at exit: 176 bytes in 2 blocks
==31715== total heap usage: 2 allocs, 0 frees, 176 bytes allocated
==31715==
==31715== 16 bytes in 1 blocks are still reachable in loss record 1 of 2
==31715== at 0x4C294C0: operator new(unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==31715== by 0x408AB1: CxxTest::ErrorPrinter::ErrorPrinter(std::ostream&, char const*, char const*) (ErrorPrinter.h:43)
==31715== by 0x407F4C: main (runner.cpp:17)
==31715==
==31715== 160 bytes in 1 blocks are still reachable in loss record 2 of 2
==31715== at 0x4C294C0: operator new(unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==31715== by 0x40B2E3: __gnu_cxx::new_allocator<InterruptServiceRoutine*>::allocate(unsigned long, void const*) (new_allocator.h:104)
==31715== by 0x40B315: std::_Vector_base<InterruptServiceRoutine*, std::allocator<InterruptServiceRoutine*> >::_M_allocate(unsigned long) (in test/out/signals)
==31715== by 0x40B941: InterruptServiceRoutine** std::vector<InterruptServiceRoutine*, std::allocator<InterruptServiceRoutine*> >::_M_allocate_and_copy<std::move_iterator<InterruptServiceRoutine**> >(unsigned long, std::move_iterator<InterruptServiceRoutine**>, std::move_iterator<InterruptServiceRoutine**>) (stl_vector.h:1138)
==31715== by 0x40BA28: std::vector<InterruptServiceRoutine*, std::allocator<InterruptServiceRoutine*> >::reserve(unsigned long) (vector.tcc:75)
==31715== by 0x40AE7D: Signals::clear() (Signals.cpp:57)
==31715== by 0x40AF50: Signals::Signals(Logger&) (Signals.cpp:32)
==31715== by 0x403531: SignalsTestSuite::SignalsTestSuite() (in test/out/signals)
==31715== by 0x40302D: __static_initialization_and_destruction_0(int, int) (signals.cpp:18)
==31715== by 0x403144: _GLOBAL__sub_I_suite_SignalsTestSuite_init (signals.cpp:39)
==31715== by 0x4147EC: __libc_csu_init (elf-init.c:88)
==31715== by 0x5A8DA34: (below main) (libc-start.c:245)
==31715==
==31715== LEAK SUMMARY:
==31715== definitely lost: 0 bytes in 0 blocks
==31715== indirectly lost: 0 bytes in 0 blocks
==31715== possibly lost: 0 bytes in 0 blocks
==31715== still reachable: 176 bytes in 2 blocks
==31715== suppressed: 0 bytes in 0 blocks
==31715==
==31715== For counts of detected and suppressed errors, rerun with: -v
==31715== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
Erreur de segmentation
我试图找出为什么有缺失的符号(0x00007fffffffd210在?? ?()和0xFFEFFF1F0: ??…):
(gdb) info share
From To Syms Read Shared Object Library
0x00007ffff7ddca80 0x00007ffff7df5960 Yes /lib64/ld-linux-x86-64.so.2
No linux-vdso.so.1
0x00007ffff7bc6a40 0x00007ffff7bd2781 Yes /lib64/libpthread.so.0
0x00007ffff79bb360 0x00007ffff79be0dc Yes /lib64/librt.so.1
0x00007ffff770f5f0 0x00007ffff77733c3 Yes /usr/lib/gcc/x86_64-pc-linux-gnu/4.8.4/libstdc++.so.6
0x00007ffff73c04f0 0x00007ffff7425266 Yes /lib64/libm.so.6
0x00007ffff71a7ac0 0x00007ffff71b6e45 Yes /usr/lib/gcc/x86_64-pc-linux-gnu/4.8.4/libgcc_s.so.1
0x00007ffff6e2c430 0x00007ffff6f53b44 Yes /lib64/libc.so.6
但是无法找到"linux-vdso.so. so."的方法。1
我是一个初学者在c++我做错了什么内存?你有什么建议吗?
Edit1:
routine_t和__sighandler_t类型是void (*)(void)
相信您可以放心忽略该错误。在成员中排名前0.25%的StackOverflow成员(!)表示，此警告"无法为linux-vdso.so.1加载共享库符号"是可以忽略的。要查看这篇文章，请访问这里:
无法加载linux-vdso.so.1的共享库符号。当调试
多亏了Igor Tandetnik，问题解决了。
最后下面的代码函数。
signals.h :
#ifndef __SIGNALS_H__
#define __SIGNALS_H__
#include <vector>
#include <ISR.h>
#include <signal.h>
using namespace std;
class Logger;
class Signals
{
private:
Logger& log;
static bool action_handled;
void reserve();
public:
static void start();
static void stop();
static std::vector<ISR_t*> isr_table;
Signals(Logger& _log);
~Signals();
unsigned int count(void);
void clear(void);
void connect(ISR_t&);
static void apply(int);
static void unmask_pthread_signals();
static void mask_pthread_signals();
};
#endif // __SIGNALS_H__
signals.cpp :
#include <functional>
#include <signal.h>
#include <pthread.h>
#include <ISR.h>
#include <Signals.h>
#include <Logger.h>
using namespace std;
vector<ISR_t*> Signals::isr_table={};
bool Signals::action_handled=false;
void Signals::apply(int)
{
mask_pthread_signals();
for (unsigned int i=0; i < isr_table.size(); ++i)
{
isr_table[i]->apply();
}
unmask_pthread_signals();
}
Signals::Signals(Logger& _log): log(_log){
clear();
start();
}
Signals::~Signals() {
clear();
stop();
}
void Signals::clear(void)
{
isr_table.clear();
isr_table.reserve(0);
}
unsigned int Signals::count(void)
{
return isr_table.size();
}
void Signals::start()
{
if (action_handled) return;
struct sigaction new_action;
new_action.sa_handler = (__sighandler_t) &Signals::apply;
new_action.sa_flags = 0;
sigemptyset(&new_action.sa_mask);
sigaction(SIGUSR1, &new_action, NULL);
unmask_pthread_signals();
action_handled = true;
}
void Signals::stop()
{
if (!action_handled) return;
struct sigaction new_action;
new_action.sa_handler = SIG_DFL;
sigemptyset(&new_action.sa_mask);
sigaction(SIGUSR1, &new_action, NULL);
mask_pthread_signals();
action_handled = false;
}
void Signals::unmask_pthread_signals()
{
sigset_t signals_mask;
sigemptyset(&signals_mask);
pthread_sigmask(SIG_SETMASK, &signals_mask, NULL);
}
void Signals::mask_pthread_signals()
{
sigset_t signals_mask;
sigfillset(&signals_mask);
pthread_sigmask(SIG_SETMASK, &signals_mask, NULL);
}
void Signals::reserve()
{
if (isr_table.capacity() <= isr_table.size()) {
isr_table.reserve(isr_table.capacity() + 20);
}
}
void Signals::connect(ISR_t &isr)
{
start();
reserve();
isr_table.push_back(&isr);
}
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