mutex_setbit.il

来自「symbian 下的helix player源代码」· IL 代码 · 共 114 行

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/*
 *  mutex_setbit.il
 *
 *  Solaris/SPARC inline assembly mutex routines used by mutex.h
 *
 *  Note: These are implemented using the standard SPARC leaf procedure
 *  optimization, so the %o "output" registers are acutally our input and
 *  local registers.
 *
 */



/***********************************************************************
 * extern "C" int _HXMutexSetBitCAS(HX_MUTEX pLock)             %i0
 *
 * Test-and-Set primitive op based on CAS.
 *
 * This implementation is based on an example from The SPARC Architecture 
 * Manual V9, pg. 318.
 * This is implemented using the SPARC leaf procedure optimization.
 * This is implemented using CAS which is not available on older processors.
 */
.inline _HXMutexSetBitCAS,4     /* one 32-bit arg == 4 bytes */
    mov 1,%o1
    cas [%o0],%g0,%o1
    mov %o1,%o0
    membar #LoadLoad | #LoadStore
.end


/***********************************************************************
 * extern "C" int _HXMutexLockImp(HX_MUTEX pLock)                %i0
 *
 * Note: This is implemented using the standard SPARC leaf procedure
 * optimization, so the %o "output" registers are acutally our
 * input and local registers.
 *
 * Note: this implementation is based on an example from
 * The SPARC Architecture Manual V9, pg. 318.
 */
.inline _HXMutexClearBit,4      /* one 32-bit arg == 4 bytes */
    membar #StoreStore
    membar #LoadStore
    stw  %g0,[%o0]
.end


/***********************************************************************
 * extern "C" int _HXMutexSetBitSWAP(HX_MUTEX pLock)            %i0
 *
 * Test-and-Set primitive op based on SWAP.
 * This is the old, less scalable SWAP-based test-and-test lock.
 *
 * This is implemented using the SPARC leaf procedure optimization.
 *
 * THIS IS CURRENTLY UNUSED!  USE _HXMutexSetBitCAS!
 */
.inline _HXMutexSetBitSWAP,4    /* one 32-bit arg == 4 bytes */
    mov  %o0,%o2
    mov  1,%o0
    swap [%o2],%o0
.end