std::async is not working in c++11, linux platform
bool tf()
{
sleep(5000);
return true;
}
int main()
{
std::future<bool> bb = std::async(std::launch::async, tf);
bool b = false;
while(1)
{
if(b == true) break;
b = bb.get();
}
return 0;
}
why don't work?
I intended to terminate program after 5 seconds. However, the program is freezing.
c++ c++11 pthreads
asked Nov 22 '18 at 8:18
user3416447user3416447
4227
add a comment |
bool tf()
{
sleep(5000);
return true;
}
int main()
{
std::future<bool> bb = std::async(std::launch::async, tf);
bool b = false;
while(1)
{
if(b == true) break;
b = bb.get();
}
return 0;
}
why don't work?
I intended to terminate program after 5 seconds. However, the program is freezing.
c++ c++11 pthreads
asked Nov 22 '18 at 8:18
user3416447user3416447
4227
2
sleeptake parameter in seconds. So your program goes to sleep for500seconds. Probably you meanusleep.
– Konstantin T.
Nov 22 '18 at 8:22
Check your assumptions:man 3 sleep
– molbdnilo
Nov 22 '18 at 8:24
2
As an aside:bb.get()will block your main thread until the future is completed or ruined. It does not make sense to call this method in a loop.
– Botje
Nov 22 '18 at 8:26
Related: stackoverflow.com/questions/1658386/sleep-function-in-c
– Hulk
Nov 22 '18 at 8:33
add a comment |
bool tf()
{
sleep(5000);
return true;
}
int main()
{
std::future<bool> bb = std::async(std::launch::async, tf);
bool b = false;
while(1)
{
if(b == true) break;
b = bb.get();
}
return 0;
}
why don't work?
I intended to terminate program after 5 seconds. However, the program is freezing.
c++ c++11 pthreads
asked Nov 22 '18 at 8:18
user3416447user3416447
4227
bool tf()
{
sleep(5000);
return true;
}
int main()
{
std::future<bool> bb = std::async(std::launch::async, tf);
bool b = false;
while(1)
{
if(b == true) break;
b = bb.get();
}
return 0;
}
why don't work?
I intended to terminate program after 5 seconds. However, the program is freezing.
c++ c++11 pthreads
c++ c++11 pthreads
asked Nov 22 '18 at 8:18
user3416447user3416447
4227
asked Nov 22 '18 at 8:18
user3416447user3416447
4227
asked Nov 22 '18 at 8:18
user3416447user3416447
4227
asked Nov 22 '18 at 8:18
user3416447user3416447
4227
asked Nov 22 '18 at 8:18
user3416447user3416447
4227
4227
2
sleeptake parameter in seconds. So your program goes to sleep for500seconds. Probably you meanusleep.
– Konstantin T.
Nov 22 '18 at 8:22
Check your assumptions:man 3 sleep
– molbdnilo
Nov 22 '18 at 8:24
2
As an aside:bb.get()will block your main thread until the future is completed or ruined. It does not make sense to call this method in a loop.
– Botje
Nov 22 '18 at 8:26
Related: stackoverflow.com/questions/1658386/sleep-function-in-c
– Hulk
Nov 22 '18 at 8:33
add a comment |
2
sleeptake parameter in seconds. So your program goes to sleep for500seconds. Probably you meanusleep.
– Konstantin T.
Nov 22 '18 at 8:22
Check your assumptions:man 3 sleep
– molbdnilo
Nov 22 '18 at 8:24
2
As an aside:bb.get()will block your main thread until the future is completed or ruined. It does not make sense to call this method in a loop.
– Botje
Nov 22 '18 at 8:26
Related: stackoverflow.com/questions/1658386/sleep-function-in-c
– Hulk
Nov 22 '18 at 8:33
2
2
sleep take parameter in seconds. So your program goes to sleep for 500 seconds. Probably you mean usleep.– Konstantin T.
Nov 22 '18 at 8:22
sleep take parameter in seconds. So your program goes to sleep for 500 seconds. Probably you mean usleep.– Konstantin T.
Nov 22 '18 at 8:22
Check your assumptions:
man 3 sleep– molbdnilo
Nov 22 '18 at 8:24
Check your assumptions:
man 3 sleep– molbdnilo
Nov 22 '18 at 8:24
2
2
As an aside:
bb.get() will block your main thread until the future is completed or ruined. It does not make sense to call this method in a loop.– Botje
Nov 22 '18 at 8:26
As an aside:
bb.get() will block your main thread until the future is completed or ruined. It does not make sense to call this method in a loop.– Botje
Nov 22 '18 at 8:26
Related: stackoverflow.com/questions/1658386/sleep-function-in-c
– Hulk
Nov 22 '18 at 8:33
Related: stackoverflow.com/questions/1658386/sleep-function-in-c
– Hulk
Nov 22 '18 at 8:33
add a comment |
1 Answer
1
active
oldest
votes
There is a much better alternative to the direct use of invoking a global sleep. Use the <chrono> header and the string literals it provides together with std::this_thread::sleep_for. This is less error prone, e.g.
#include <chrono>
// Bring the literals into the scope:
using namespace std::chrono_literals;
bool tf()
{
std::this_thread::sleep_for(5s);
// ^^ Awesome! How readable is this?!
return true;
}
Together with the rest of the snippet you posted, this should work as intended.
edited Nov 22 '18 at 10:48
T.C.
106k13217321
answered Nov 22 '18 at 8:24
lubgrlubgr
10.4k21745
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
There is a much better alternative to the direct use of invoking a global sleep. Use the <chrono> header and the string literals it provides together with std::this_thread::sleep_for. This is less error prone, e.g.
#include <chrono>
// Bring the literals into the scope:
using namespace std::chrono_literals;
bool tf()
{
std::this_thread::sleep_for(5s);
// ^^ Awesome! How readable is this?!
return true;
}
Together with the rest of the snippet you posted, this should work as intended.
edited Nov 22 '18 at 10:48
T.C.
106k13217321
answered Nov 22 '18 at 8:24
lubgrlubgr
10.4k21745
add a comment |
There is a much better alternative to the direct use of invoking a global sleep. Use the <chrono> header and the string literals it provides together with std::this_thread::sleep_for. This is less error prone, e.g.
#include <chrono>
// Bring the literals into the scope:
using namespace std::chrono_literals;
bool tf()
{
std::this_thread::sleep_for(5s);
// ^^ Awesome! How readable is this?!
return true;
}
Together with the rest of the snippet you posted, this should work as intended.
edited Nov 22 '18 at 10:48
T.C.
106k13217321
answered Nov 22 '18 at 8:24
lubgrlubgr
10.4k21745
add a comment |
There is a much better alternative to the direct use of invoking a global sleep. Use the <chrono> header and the string literals it provides together with std::this_thread::sleep_for. This is less error prone, e.g.
#include <chrono>
// Bring the literals into the scope:
using namespace std::chrono_literals;
bool tf()
{
std::this_thread::sleep_for(5s);
// ^^ Awesome! How readable is this?!
return true;
}
Together with the rest of the snippet you posted, this should work as intended.
edited Nov 22 '18 at 10:48
T.C.
106k13217321
answered Nov 22 '18 at 8:24
lubgrlubgr
10.4k21745
There is a much better alternative to the direct use of invoking a global sleep. Use the <chrono> header and the string literals it provides together with std::this_thread::sleep_for. This is less error prone, e.g.
#include <chrono>
// Bring the literals into the scope:
using namespace std::chrono_literals;
bool tf()
{
std::this_thread::sleep_for(5s);
// ^^ Awesome! How readable is this?!
return true;
}
Together with the rest of the snippet you posted, this should work as intended.
edited Nov 22 '18 at 10:48
T.C.
106k13217321
answered Nov 22 '18 at 8:24
lubgrlubgr
10.4k21745
edited Nov 22 '18 at 10:48
T.C.
106k13217321
edited Nov 22 '18 at 10:48
T.C.
106k13217321
edited Nov 22 '18 at 10:48
T.C.
106k13217321
106k13217321
answered Nov 22 '18 at 8:24
lubgrlubgr
10.4k21745
answered Nov 22 '18 at 8:24
lubgrlubgr
10.4k21745
answered Nov 22 '18 at 8:24
lubgrlubgr
10.4k21745
10.4k21745
add a comment |
add a comment |
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2
sleeptake parameter in seconds. So your program goes to sleep for500seconds. Probably you meanusleep.– Konstantin T.
Nov 22 '18 at 8:22
Check your assumptions:
man 3 sleep– molbdnilo
Nov 22 '18 at 8:24
2
As an aside:
bb.get()will block your main thread until the future is completed or ruined. It does not make sense to call this method in a loop.– Botje
Nov 22 '18 at 8:26
Related: stackoverflow.com/questions/1658386/sleep-function-in-c
– Hulk
Nov 22 '18 at 8:33