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66 lines
1.5 KiB
C++
66 lines
1.5 KiB
C++
/*
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# http://blog.csdn.net/win_lin/article/details/40948277
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# for all supports setjmp and longjmp:
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g++ -g -O0 -o jmp_2flow jmp_2flow.cpp
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <setjmp.h>
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jmp_buf context_thread_0;
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jmp_buf context_thread_1;
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void thread0_functions()
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{
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int ret = setjmp(context_thread_0);
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// when ret is 0, create thread,
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// when ret is not 0, longjmp to this thread.
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if (ret == 0) {
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return;
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}
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int age = 10000;
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const char* name = "winlin";
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printf("[thread0] age=%d, name=%s\n", age, name);
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if (!setjmp(context_thread_0)) {
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printf("[thread0] switch to thread1\n");
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longjmp(context_thread_1, 1);
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}
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// crash, for the stack is modified by thread1.
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// name = 0x2b67004009c8 <error: Cannot access memory at address 0x2b67004009c8>
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printf("[thread0] terminated, age=%d, name=%s\n", age, name);
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exit(0);
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}
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void thread1_functions()
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{
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int ret = setjmp(context_thread_1);
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// when ret is 0, create thread,
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// when ret is not 0, longjmp to this thread.
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if (ret == 0) {
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return;
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}
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int age = 11111;
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printf("[thread1] age=%d\n", age);
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if (!setjmp(context_thread_1)) {
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printf("[thread1] switch to thread0\n");
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longjmp(context_thread_0, 1);
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}
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printf("[thread1] terminated, age=%d\n", age);
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exit(0);
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}
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int main(int argc, char** argv)
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{
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thread0_functions();
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thread1_functions();
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// kickstart
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longjmp(context_thread_0, 1);
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return 0;
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}
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