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Returns whether the thread object is joinable.
A thread object is joinable if it represents a thread of execution.
A thread object is not joinable in any of these cases:
Output (after 3 seconds):
Reference
C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
-
<cfenv> (fenv.h)C++11
- <cfloat> (float.h)
-
<cinttypes> (inttypes.h)C++11
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
-
<cstdbool> (stdbool.h)C++11
- <cstddef> (stddef.h)
-
<cstdint> (stdint.h)C++11
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
-
<ctgmath> (tgmath.h)C++11
- <ctime> (time.h)
-
<cuchar> (uchar.h)C++11
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
-
<array>C++11
- <deque>
-
<forward_list>C++11
- <list>
- <map>
- <queue>
- <set>
- <stack>
-
<unordered_map>C++11
-
<unordered_set>C++11
- <vector>
-
Input/Output:
Multi-threading:
-
<atomic>C++11
-
<condition_variable>C++11
-
<future>C++11
-
<mutex>C++11
-
<thread>C++11
-
Other:
- <algorithm>
- <bitset>
-
<chrono>C++11
-
<codecvt>C++11
- <complex>
- <exception>
- <functional>
-
<initializer_list>C++11
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
-
<random>C++11
-
<ratio>C++11
-
<regex>C++11
- <stdexcept>
- <string>
-
<system_error>C++11
-
<tuple>C++11
-
<type_traits>C++11
-
<typeindex>C++11
- <typeinfo>
- <utility>
- <valarray>
<thread>
classes
-
threadC++11
-
namespaces
-
this_threadC++11
-
thread
-
thread::~threadC++11
-
thread::threadC++11
member functions
-
thread::detachC++11
-
thread::get_idC++11
-
thread::joinC++11
-
thread::joinableC++11
-
thread::native_handleC++11
-
thread::operator=C++11
-
thread::swapC++11
-
member types
-
thread::idC++11
-
thread::native_handle_typeC++11
-
static member functions
non-member overloads
-
swap (thread)C++11
-
public member function
<thread>
std::thread::joinable
bool joinable() const noexcept;
Check if joinable
A thread object is joinable if it represents a thread of execution.
A thread object is not joinable in any of these cases:
- if it was default-constructed.
- if it has been moved from (either constructing another thread object, or assigning to it).
- if either of its members join or detach has been called.
Parameters
noneReturn value
true if the thread is joinable.false otherwise.Example
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Output (after 3 seconds):
Joinable after construction: foo: false bar: true Joinable after joining: foo: false bar: false |
Data races
The object is accessed.Exception safety
No-throw guarantee: never throws exceptions.See also
- thread::join
- Join thread (public member function)
- thread::get_id
- Get thread id (public member function)
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Spotted an error? contact us