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atomic_compare_exchange_weak, atomic_compare_exchange_strong, atomic_compare_exchange_weak_explicit, atomic_compare_exchange_strong_explicit

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< c‎ | atomic

 
 
Atomare Operationen Bibliothek
Types
Original:
Types
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memory_order
atomic_flag
Makros
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Macros
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ATOMIC_***_LOCK_FREE
ATOMIC_FLAG_INIT
ATOMIC_VAR_INIT
kill_dependency
Funktionen
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Functions
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atomic_flag_test_and_set
atomic_flag_clear
atomic_init
atomic_is_lock_free
atomic_store
atomic_load
atomic_exchange
atomic_compare_exchange
atomic_fetch_add
atomic_fetch_sub
atomic_fetch_or
atomic_fetch_xor
atomic_fetch_and
atomic_thread_fence
atomic_signal_fence
 
Defined in header <stdatomic.h>
_Bool atomic_compare_exchange_strong( volatile A* obj,
                                      C* expected, C desired );
(1)
_Bool atomic_compare_exchange_weak( volatile A *obj,
                                    C* expected, C desired );
(2)
_Bool atomic_compare_exchange_strong_explicit( volatile A* obj,

                                               C* expected, C desired,
                                               memory_order succ,

                                               memory_order fail );
(3)
_Bool atomic_compare_exchange_weak_explicit( volatile A *obj,

                                             C* expected, C desired,
                                             memory_order succ,

                                             memory_order fail );
(4)
Atomar vergleicht den Wert, auf den durch obj mit dem Wert, auf den durch expected, und wenn diese gleich sind, ersetzt die früheren mit desired (durchführt Lese-Modifizieren-Schreib-Operation). Andernfalls lädt den aktuellen Wert, auf den obj in *expected (führt im Leerlauf) .
Original:
Atomically compares the value pointed to by obj with the value pointed to by expected, and if those are equal, replaces the former with desired (performs read-modify-write operation). Otherwise, loads the actual value pointed to by obj into *expected (performs load operation).
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Die Speichermodule Modelle für die Lese-Modifizieren-Schreiben und Ladeoperationen sind succ und fail sind. Die (1-2)-Versionen verwenden memory_order_seq_cst standardmäßig .
Original:
The memory models for the read-modify-write and load operations are succ and fail respectively. The (1-2) versions use memory_order_seq_cst by default.
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Die schwachen Formen ((1) und (3)) der Funktionen dürfen spuriously scheitern, das ist, als ob *obj != *expected handeln, auch wenn sie gleich sind. Wenn ein Vergleichs-und Austausch in einer Schleife ist, wird die schwache Version eine bessere Leistung auf einigen Plattformen. Wenn ein schwacher Vergleichen und-Austausch würde eine Schleife und eine starke eins erfordern würde nicht, ist der Starke vorzuziehen .
Original:
The weak forms ((1) and (3)) of the functions are allowed to fail spuriously, that is, act as if *obj != *expected even if they are equal. When a compare-and-exchange is in a loop, the weak version will yield better performance on some platforms. When a weak compare-and-exchange would require a loop and a strong one would not, the strong one is preferable.
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Dies ist ein für alle atomaren generische Funktion Objekttypen definiert. A ist der Typ eines atomaren Objekt, ist das nicht-C Atomtyp entsprechend A .
Original:
This is a generische Funktion defined for all atomic object types. A is the type of an atomic object, C is the non-atomic type corresponding to A.
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[Bearbeiten] Parameter

obj -
Zeiger auf die atomare Objekt zu testen und zu modifizieren
Original:
pointer to the atomic object to test and modify
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expected -
Zeiger auf den Wert soll im atomaren Objekt gefunden werden
Original:
pointer to the value expected to be found in the atomic object
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desired -
der Wert in der atomaren Objekt zu speichern, wenn es wie erwartet
Original:
the value to store in the atomic object if it is as expected
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succ -
der Speicher Synchronisation Bestellsystem für die Lese-Modifizieren-Schreib-Operation, wenn der Vergleich erfolgreich ist. Alle Werte sind zulässig .
Original:
the memory synchronization ordering for the read-modify-write operation if the comparison succeeds. All values are permitted.
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fail -
der Speicher Synchronisation Bestellsystem für die Ladeoperation, wenn der Vergleich fehlschlägt. Kann nicht sein memory_order_release oder memory_order_ack_rel und können nicht angeben, stärker Bestellung als succ
Original:
the memory synchronization ordering for the load operation if the comparison fails. Cannot be memory_order_release or memory_order_ack_rel and cannot specify stronger ordering than succ
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[Bearbeiten] Rückgabewert

Das Ergebnis des Vergleichs: true wenn *obj gleich *exp war, ansonsten false .
Original:
The result of the comparison: true if *obj was equal to *exp, false otherwise.
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[Bearbeiten] Siehe auch

Swaps ein Wert mit dem Wert eines atomaren Objekt
Original:
swaps a value with the value of an atomic object
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(Funktion) [edit]
C++ documentation for atomic_compare_exchange_weak, atomic_compare_exchange_strong, atomic_compare_exchange_weak_explicit, atomic_compare_exchange_strong_explicit