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# core.atomic

The atomic module provides basic support for lock-free concurrent programming.
License:
Boost License 1.0
Authors:
Sean Kelly, Alex Rønne Petersen

Source core/atomic.d

pure nothrow @nogc @safe TailShared!T `atomicOp`(string op, T, V1)(ref shared T `val`, V1 `mod`)
if (__traits(compiles, mixin("*cast(T*)&`val`" ~ op ~ "`mod`")));
  Performs the binary operation 'op' on val using 'mod' as the modifier.
  Parameters:

  T `val` | The target variable.
  V1 `mod` | The modifier to apply.

  Returns:
  The result of the operation.
pure nothrow @nogc @safe bool `cas`(T, V1, V2)(shared(T)* `here`, const V1 `ifThis`, V2 `writeThis`)
if (!is(T == class) && !is(T U : U*) && __traits(compiles, () { *`here` = `writeThis`; } ));
pure nothrow @nogc @safe bool `cas`(T, V1, V2)(shared(T)* `here`, const shared(V1) `ifThis`, shared(V2) `writeThis`)
if (is(T == class) && __traits(compiles, () { *`here` = `writeThis`; } ));
pure nothrow @nogc @safe bool `cas`(T, V1, V2)(shared(T)* `here`, const shared(V1)* `ifThis`, shared(V2)* `writeThis`)
if (is(T U : U*) && __traits(compiles, () { *`here` = `writeThis`; } ));
  Stores 'writeThis' to the memory referenced by 'here' if the value referenced by 'here' is equal to 'ifThis'. This operation is both lock-free and atomic.
  Parameters:

  shared(T)* `here` | The address of the destination variable.
  V2 `writeThis` | The value to store.
  V1 `ifThis` | The comparison value.

  Returns:
  true if the store occurred, false if not.
pure nothrow @nogc @safe TailShared!T `atomicLoad`(MemoryOrder ms = MemoryOrder.seq, T)(ref const shared T `val`);
  Loads 'val' from memory and returns it. The memory barrier specified by 'ms' is applied to the operation, which is fully sequenced by default. Valid memory orders are MemoryOrder.raw, MemoryOrder.acq, and MemoryOrder.seq.
  Parameters:

  T `val` | The target variable.

  Returns:
  The value of 'val'.
pure nothrow @nogc @safe void `atomicStore`(MemoryOrder ms = MemoryOrder.seq, T, V1)(ref shared T `val`, V1 `newval`)
if (__traits(compiles, () { `val` = `newval`; } ));
  Writes 'newval' into 'val'. The memory barrier specified by 'ms' is applied to the operation, which is fully sequenced by default. Valid memory orders are MemoryOrder.raw, MemoryOrder.rel, and MemoryOrder.seq.
  Parameters:

  T `val` | The target variable.
  V1 `newval` | The value to store.

enum `MemoryOrder`: int;
  Specifies the memory ordering semantics of an atomic operation.
  See Also:
  en.cppreference.com/w/cpp/atomic/memory_order
  `raw`
    Not sequenced. Corresponds to LLVM AtomicOrdering.Monotonic and C++11/C11 memory_order_relaxed.
  `acq`
    Hoist-load + hoist-store barrier. Corresponds to LLVM AtomicOrdering.Acquire and C++11/C11 memory_order_acquire.
  `rel`
    Sink-load + sink-store barrier. Corresponds to LLVM AtomicOrdering.Release and C++11/C11 memory_order_release.
  `seq`
    Fully sequenced (acquire + release). Corresponds to LLVM AtomicOrdering.SequentiallyConsistent and C++11/C11 memory_order_seq_cst.
nothrow @nogc void `atomicFence`();
  Inserts a full load/store memory fence (on platforms that need it). This ensures that all loads and stores before a call to this function are executed before any loads and stores after the call.

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