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alarmthrow.cpp
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alarmthrow.cpp
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// http://web.eecs.utk.edu/~huangj/cs360/360/notes/Setjmp/lecture.html
#include <csignal>
#include <unistd.h> // alarm
#include <csetjmp>
#include <iostream>
using namespace std;
int inner, outer;
time_t tStart;
jmp_buf Env;
void signal_handler(int sig)
{
if(sig == SIGALRM) {
time_t tElapsed;
tElapsed = time(0) - tStart;
cout << tElapsed << " second" << (tElapsed == 1? "": "s");
cout << ": outer loop = " << outer << "/10000, inner loop = " << inner << "/1000000\n";
if (tElapsed >= 4) {
cout <<"signal_handler says \"Give up\"\n";
longjmp(Env, 1);
}
alarm(1);
signal(SIGALRM, signal_handler);
}
}
int main(int argc, char**argv)
{
try {
signal(SIGALRM, signal_handler);
alarm(1);
if (setjmp(Env) != 0) {
cout << "received signal to \"Give up:\" outer loop = " << outer << "/10000, inner loop = " << inner << "/1000000\n";
throw "gave up\n";
}
tStart = time(0);
for (outer = 0; outer < 10*1000; outer++) {
for (inner = 0; inner < 1000*1000; inner++);
}
} catch (const char*msg) {
cout << "Program threw: " << msg << "\n";
} catch (...) {
cout << "Program threw\n";
}
}