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Difference between revisions of "cpp/atomic/atomic flag notify all"

From cppreference.com
< cpp‎ | atomic
m
(Splitted the volatile overloads.)
 
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{{cpp/thread/navbar}}
 
{{cpp/thread/navbar}}
 
{{dcl begin}}
 
{{dcl begin}}
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{{dcl header | atomic }}
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{{dcl header|atomic}}
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{{dcl rev begin | since=c++20}}
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{{dcl|num=1|since=c++20|
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{{dcl |  
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void atomic_flag_notify_all( std::atomic_flag* object ) noexcept;
 
void atomic_flag_notify_all( std::atomic_flag* object ) noexcept;
 
}}
 
}}
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{{dcl |
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{{dcl|num=2|since=c++20|
 
void atomic_flag_notify_all( volatile std::atomic_flag* object ) noexcept;
 
void atomic_flag_notify_all( volatile std::atomic_flag* object ) noexcept;
 
}}
 
}}
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{{dcl rev end}}
 
 
{{dcl end}}
 
{{dcl end}}
  
 
Performs atomic notifying operations.
 
Performs atomic notifying operations.
  
−
Unblocks all threads blocked in atomic waiting operations (i.e. {{lc|std::atomic_flag_wait()}}, {{lc|std::atomic_flag_wait_explicit()}}, or {{lc|std::atomic_flag::wait()}}) on {{c|*object}}, if there are any; otherwise does nothing.
+
Unblocks all threads blocked in atomic waiting operations (i.e. {{lc|std::atomic_flag_wait()}}, {{lc|std::atomic_flag_wait_explicit()}}, or {{l2tf std|cpp/atomic/atomic_flag/wait}}) on {{c|*object}}, if there are any; otherwise does nothing.
  
 
Equivalent to {{c|object->notify_all()}}.
 
Equivalent to {{c|object->notify_all()}}.
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===Parameters===
 
===Parameters===
 
{{par begin}}
 
{{par begin}}
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{{par | object | pointer to the atomic_flag object to notify}}
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{{par|object|pointer to the {{tt|atomic_flag}} object to notify}}
 
{{par end}}  
 
{{par end}}  
  
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===See also===
 
===See also===
 
{{dsc begin}}
 
{{dsc begin}}
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{{dsc inc | cpp/atomic/atomic/dsc notify_one | atomic_flag}}
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{{dsc inc|cpp/atomic/atomic/dsc notify_one|atomic_flag}}
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{{dsc inc | cpp/atomic/atomic/dsc notify_all | atomic_flag}}
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{{dsc inc|cpp/atomic/atomic/dsc notify_all|atomic_flag}}
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{{dsc inc | cpp/atomic/dsc atomic_flag_wait}}
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{{dsc inc|cpp/atomic/dsc atomic_flag_wait}}
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{{dsc inc | cpp/atomic/dsc atomic_flag_notify_one}}
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{{dsc inc|cpp/atomic/dsc atomic_flag_notify_one}}
 
{{dsc end}}
 
{{dsc end}}
  
 
{{langlinks|de|es|fr|it|ja|pt|ru|zh}}
 
{{langlinks|de|es|fr|it|ja|pt|ru|zh}}

Latest revision as of 00:12, 25 September 2023

 
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atomic_flag_notify_all
(C++20)
 
Defined in header <atomic>
void atomic_flag_notify_all( std::atomic_flag* object ) noexcept;
 (1) (since C++20)
void atomic_flag_notify_all( volatile std::atomic_flag* object ) noexcept;
 (2) (since C++20)

Performs atomic notifying operations.

Unblocks all threads blocked in atomic waiting operations (i.e. std::atomic_flag_wait(), std::atomic_flag_wait_explicit(), or std::atomic_flag::wait()) on *object, if there are any; otherwise does nothing.

Equivalent to object->notify_all().

Contents

[edit] Parameters

object - pointer to the atomic_flag object to notify

[edit] Return value

(none)

[edit] Notes

This form of change-detection is often more efficient than simple polling or pure spinlocks.

[edit] Example

This section is incomplete
Reason: no example

[edit] See also

(C++20)
 notifies at least one thread waiting on the atomic object
(public member function of std::atomic_flag) [edit]
(C++20)
 notifies all threads blocked waiting on the atomic object
(public member function of std::atomic_flag) [edit]
(C++20)(C++20)
 blocks the thread until notified and the flag changes
(function) [edit]
(C++20)
 notifies a thread blocked in atomic_flag_wait
(function) [edit]
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