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author | Owen Anderson <resistor@mac.com> | 2009-06-17 00:13:00 +0000 |
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committer | Owen Anderson <resistor@mac.com> | 2009-06-17 00:13:00 +0000 |
commit | 9a3df671ab49db61ef6234cf90b7ea7dc2a53917 (patch) | |
tree | 3da7419e06a5b3fe7e8293549c75907e8b1257f1 /lib/System/Atomic.cpp | |
parent | 142fb2acdd4b94a73e2c992b9ed57ee1449ab818 (diff) | |
download | llvm-9a3df671ab49db61ef6234cf90b7ea7dc2a53917.tar.gz llvm-9a3df671ab49db61ef6234cf90b7ea7dc2a53917.tar.bz2 llvm-9a3df671ab49db61ef6234cf90b7ea7dc2a53917.tar.xz |
Add an atomic increment and decrement implementation, which will be used for
thread-safe reference counting.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73587 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/System/Atomic.cpp')
-rw-r--r-- | lib/System/Atomic.cpp | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/System/Atomic.cpp b/lib/System/Atomic.cpp index 2827d88965..9d8ac925b8 100644 --- a/lib/System/Atomic.cpp +++ b/lib/System/Atomic.cpp @@ -51,3 +51,31 @@ sys::cas_flag sys::CompareAndSwap(volatile sys::cas_flag* ptr, # error No compare-and-swap implementation for your platform! #endif } + +sys::cas_flag sys::AtomicPostIncrement(volatile sys::cas_flag* ptr) { +#if LLVM_MULTITHREADED==0 + ++(*ptr); + return *ptr; +#elif defined(__GNUC__) + return __sync_add_and_fetch(ptr, 1); +#elif defined(_MSC_VER) + return InterlockedCompareExchange(ptr, new_value, old_value); +#else +# error No atomic increment implementation for your platform! +#endif +} + +sys::cas_flag sys::AtomicPostDecrement(volatile sys::cas_flag* ptr) { +#if LLVM_MULTITHREADED==0 + --(*ptr); + return *ptr; +#elif defined(__GNUC__) + return __sync_sub_and_fetch(ptr, 1); +#elif defined(_MSC_VER) + return InterlockedIncrement(ptr); +#else +# error No atomic decrement implementation for your platform! +#endif +} + + |