含義:非同步執行
引數:引數=
std::launch::async& \text\\ std::launch::deferred& \text \end
引數=)
;auto asynceager = std:
:async
(std:
:launch:
:async,
);std:
:this_thread:
:sleep_for
(std:
:chrono:
:seconds(1
));auto lazystart = asynclazy.
get(
)- begin;
auto eagerstart = asynceager.
get(
)- begin;
auto lazyduration = std:
:chrono:
:duration<
double
>
(lazystart)
.count()
;auto eagerduration = std:
:chrono:
:duration<
double
>
(eagerstart)
.count()
; std:
:cout <<
"asynclazy evaluated after : "
<< lazyduration <<
" seconds."
<< std:
:endl;
std:
:cout <<
"asynceager evaluated after: "
<< eagerduration <<
" seconds."
<< std:
:endl;
}含義:共享鎖
用法:允許多個執行緒以共享方式持有讀鎖,只允許乙個執行緒持有寫鎖
如果不使用c++17可以使用boost
例子
#include
#include
// for std::unique_lock
#include
#include
std:
:shared_mutex g_mutex;
int count =0;
void
readloop()
}void
writeloop()
}int
main()
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