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Add an atomic add operation.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73964 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2009-06-23 17:39:31 +00:00
parent 3b8d135879
commit 5a9c0eeaf2
2 changed files with 14 additions and 0 deletions
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1
include/llvm/System/Atomic.h
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@ -26,6 +26,7 @@ namespace llvm {
cas_flag old_value);
cas_flag AtomicIncrement(volatile cas_flag* ptr);
cas_flag AtomicDecrement(volatile cas_flag* ptr);
cas_flag AtomicAdd(volatile cas_flag* ptr, cas_flag val);
}
}

13
lib/System/Atomic.cpp
View File

@ -78,4 +78,17 @@ sys::cas_flag sys::AtomicDecrement(volatile sys::cas_flag* ptr) {
#endif
}
sys::cas_flag sys::AtomicAdd(volatile sys::cas_flag* ptr, sys::cas_flag val) {
#if LLVM_MULTITHREADED==0
*ptr += val;
return *ptr;
#elif defined(__GNUC__)
return __sync_add_and_fetch(ptr, val);
#elif defined(_MSC_VER)
return InterlockedAdd(ptr, val);
#else
# error No atomic add implementation for your platform!
#endif
}