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Diffstat (limited to 'MdePkg/Library/BaseSynchronizationLib/InterlockedDecrementMsc.c')
-rw-r--r-- | MdePkg/Library/BaseSynchronizationLib/InterlockedDecrementMsc.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseSynchronizationLib/InterlockedDecrementMsc.c b/MdePkg/Library/BaseSynchronizationLib/InterlockedDecrementMsc.c new file mode 100644 index 000000000000..eef8783ca82f --- /dev/null +++ b/MdePkg/Library/BaseSynchronizationLib/InterlockedDecrementMsc.c @@ -0,0 +1,40 @@ +/** @file + InterlockedDecrement function + + Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR> + SPDX-License-Identifier: BSD-2-Clause-Patent + +**/ + +/** + Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics. +**/ + +long _InterlockedDecrement( + long * lpAddend +); + +#pragma intrinsic(_InterlockedDecrement) + +/** + Performs an atomic decrement of an 32-bit unsigned integer. + + Performs an atomic decrement of the 32-bit unsigned integer specified by + Value and returns the decrement value. The decrement operation must be + performed using MP safe mechanisms. The state of the return value is not + guaranteed to be MP safe. + + @param Value A pointer to the 32-bit value to decrement. + + @return The decrement value. + +**/ +UINT32 +EFIAPI +InternalSyncDecrement ( + IN volatile UINT32 *Value + ) +{ + return _InterlockedDecrement ((long *)(Value)); +} + |