linux命令之pstack[通俗易懂]

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#include <stdio.h>
#include <unistd.h>
#include <pthread.h>

void *thread_proc(void *data)
{
    printf("a new thread creaded\n");
    while (1)
    {
        sleep(10);
    }

    return (void *)0;
}

int main()
{
    pthread_t tid;
    pthread_create(&tid, NULL, thread_proc, NULL);
    pthread_join(tid, NULL);
    return 0;
}

 17 backtrace="bt"
 18 if test -d /proc/$1/task ; then
 19     # Newer kernel; has a task/ directory.
 20     if test `/bin/ls /proc/$1/task | /usr/bin/wc -l` -gt 1 2>/dev/null ; then
 21         backtrace="thread apply all bt"
 22     fi
 23 elif test -f /proc/$1/maps ; then
 24     # Older kernel; go by it loading libpthread.
 25     if /bin/grep -e libpthread /proc/$1/maps > /dev/null 2>&1 ; then
 26         backtrace="thread apply all bt"
 27     fi
 28 fi

 38 # Run GDB, strip out unwanted noise.
 39 $GDB --quiet $readnever -nx /proc/$1/exe $1 <<EOF 2>&1 | 
 40 set width 0
 41 set height 0
 42 set pagination no
 43 $backtrace
 44 EOF
 45 /bin/sed -n \
 46     -e 's/^\((gdb) \)*//' \
 47     -e '/^#/p' \
 48     -e '/^Thread/p'

#include <stdio.h>
#include <pthread.h>
#include <unistd.h>

pthread_mutex_t mutex_1 = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t mutex_2 = PTHREAD_MUTEX_INITIALIZER;

void *thread1_proc(void *data)
{
    pthread_mutex_lock(&mutex_1);
    sleep(1);
    pthread_mutex_lock(&mutex_2);

    pthread_mutex_unlock(&mutex_2);
    pthread_mutex_unlock(&mutex_1);
    return (void *)0;
}

void *thread2_proc(void *data)
{
    pthread_mutex_lock(&mutex_2);
    sleep(1);
    pthread_mutex_lock(&mutex_1);

    pthread_mutex_unlock(&mutex_1);
    pthread_mutex_unlock(&mutex_2);
    return (void *)0;
}

int main()
{
    pthread_t tid1, tid2;
    pthread_create(&tid1, NULL, thread1_proc, NULL);
    pthread_create(&tid2, NULL, thread2_proc, NULL);
    pthread_join(tid1, NULL);
    pthread_join(tid2, NULL);
    return 0;
}

#define pthread_mutex_lock(arg1, arg2) \
do { \
   printf("the thread %s try to  get the lock %s\n", arg1, #arg2);  \
   pthread_mutex_lock(arg2);   \
   printf("the thread %s get the lock %s\n", arg1, #arg2);  \
}while(0);

pthread_mutex_lock("thread1", &mutex_1);   // thread2部分相同
sleep(1);
pthread_mutex_lock("thread1", &mutex_2);

...