33 Thread support library [thread]

33.3 Threads [thread.threads]

33.3.2 Class thread [thread.thread.class]

33.3.2.2 thread constructors [thread.thread.constr]

thread() noexcept;

Effects: Constructs a thread object that does not represent a thread of execution.

Postconditions: get_id() == id().

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template <class F, class... Args> explicit thread(F&& f, Args&&... args);

Requires: F and each Ti in Args shall satisfy the MoveConstructible requirements.

INVOKE(DECAY_COPY(std::forward<F>(f)), DECAY_COPY(std::forward<Args>(args))...) ([func.require]) shall be a valid expression.

Remarks: This constructor shall not participate in overload resolution if decay_t<F> is the same type as std::thread.

Effects: Constructs an object of type thread.

The new thread of execution executes INVOKE(DECAY_COPY(std::forward<F>(f)), DECAY_COPY(std::forward<Args>(args))...) with the calls to DECAY_COPY being evaluated in the constructing thread.

Any return value from this invocation is ignored.

[ Note

This implies that any exceptions not thrown from the invocation of the copy of f will be thrown in the constructing thread, not the new thread.

— end note

]

If the invocation of INVOKE(DECAY_COPY(std::forward<F>(f)), DECAY_COPY(std::forward<Args>(args))...) terminates with an uncaught exception, terminate shall be called.

Synchronization: The completion of the invocation of the constructor synchronizes with the beginning of the invocation of the copy of f.

Postconditions: get_id() != id().

*this represents the newly started thread.

Throws: system_error if unable to start the new thread.

Error conditions:

(9.1)
resource_unavailable_try_again — the system lacked the necessary resources to create another thread, or the system-imposed limit on the number of threads in a process would be exceeded.

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thread(thread&& x) noexcept;

Effects: Constructs an object of type thread from x, and sets x to a default constructed state.

Postconditions: x.get_id() == id() and get_id() returns the value of x.get_id() prior to the start of construction.