diff options
Diffstat (limited to 'gnu-efi/gnu-efi-3.0/lib/lock.c')
-rw-r--r-- | gnu-efi/gnu-efi-3.0/lib/lock.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/gnu-efi/gnu-efi-3.0/lib/lock.c b/gnu-efi/gnu-efi-3.0/lib/lock.c new file mode 100644 index 0000000..a33bec3 --- /dev/null +++ b/gnu-efi/gnu-efi-3.0/lib/lock.c @@ -0,0 +1,107 @@ +/*++ + +Copyright (c) 1998 Intel Corporation + +Module Name: + + lock.c + +Abstract: + + Implements FLOCK + + + +Revision History + +--*/ + + +#include "lib.h" + + +VOID +InitializeLock ( + IN OUT FLOCK *Lock, + IN EFI_TPL Priority + ) +/*++ + +Routine Description: + + Initialize a basic mutual exclusion lock. Each lock + provides mutual exclusion access at it's task priority + level. Since there is no-premption (at any TPL) or + multiprocessor support, acquiring the lock only consists + of raising to the locks TPL. + + Note on a debug build the lock is acquired and released + to help ensure proper usage. + +Arguments: + + Lock - The FLOCK structure to initialize + + Priority - The task priority level of the lock + + +Returns: + + An initialized F Lock structure. + +--*/ +{ + Lock->Tpl = Priority; + Lock->OwnerTpl = 0; + Lock->Lock = 0; +} + + +VOID +AcquireLock ( + IN FLOCK *Lock + ) +/*++ + +Routine Description: + + Raising to the task priority level of the mutual exclusion + lock, and then acquires ownership of the lock. + +Arguments: + + Lock - The lock to acquire + +Returns: + + Lock owned + +--*/ +{ + RtAcquireLock (Lock); +} + + +VOID +ReleaseLock ( + IN FLOCK *Lock + ) +/*++ + +Routine Description: + + Releases ownership of the mutual exclusion lock, and + restores the previous task priority level. + +Arguments: + + Lock - The lock to release + +Returns: + + Lock unowned + +--*/ +{ + RtReleaseLock (Lock); +} |