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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

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    <metanoindex/>

     
    C
     
    Atomare Operationen Bibliothek
    Types
    Original:
    Types
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    memory_order
    atomic_flag
    Makros
    Original:
    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
     
    <tbody> </tbody>
    definiert 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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    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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    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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    Siehe auch

    (C11)
    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