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119 lines
3.6 KiB
119 lines
3.6 KiB
/*
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* Copyright 2013 Samy Al Bahra.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _CK_ELIDE_H
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#define _CK_ELIDE_H
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#include <ck_cc.h>
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#include <ck_pr.h>
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/*
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* Defines an elision implementation according to the following variables:
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* N - Namespace of elision implementation.
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* T - Typename of mutex.
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* L_P - Lock predicate, returns false if resource is available.
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* L - Function to call if resource is unavailable of transaction aborts.
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* U_P - Unlock predicate, returns false if elision failed.
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* U - Function to call if transaction failed.
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*/
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#ifdef CK_F_PR_RTM
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#define CK_ELIDE_PROTOTYPE(N, T, L_P, L, U_P, U) \
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CK_CC_INLINE static void \
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ck_elide_##N##_lock(T *lock) \
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{ \
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\
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if (ck_pr_rtm_begin() != CK_PR_RTM_STARTED) { \
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L(lock); \
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return; \
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} \
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\
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if (L_P(lock) == true) \
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ck_pr_rtm_abort(0xFF); \
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\
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return; \
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} \
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CK_CC_INLINE static void \
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ck_elide_##N##_unlock(T *lock) \
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{ \
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\
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if (U_P(lock) == false) { \
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ck_pr_rtm_end(); \
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} else { \
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U(lock); \
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} \
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\
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return; \
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}
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#define CK_ELIDE_TRYLOCK_PROTOTYPE(N, T, TL_P, TL) \
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CK_CC_INLINE static bool \
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ck_elide_##N##_trylock(T *lock) \
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{ \
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\
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if (ck_pr_rtm_begin() != CK_PR_RTM_STARTED) \
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return false; \
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\
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if (TL_P(lock) == true) \
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ck_pr_rtm_abort(0xFF); \
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\
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return true; \
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}
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#else
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#define CK_ELIDE_PROTOTYPE(N, T, L_P, U_P, L, U) \
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CK_CC_INLINE static void \
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ck_elide_##N##_lock(T *lock) \
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{ \
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\
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L(lock); \
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return; \
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} \
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CK_CC_INLINE static void \
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ck_elide_##N##_unlock(T *lock) \
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{ \
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\
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U(lock); \
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return; \
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}
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#define CK_ELIDE_TRYLOCK_PROTOTYPE(N, T, TL_P, TL) \
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CK_CC_INLINE static bool \
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ck_elide_##N##_trylock(T *lock) \
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{ \
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\
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return TL_P(lock); \
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}
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#endif /* CK_F_PR_RTM */
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/*
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* Best-effort elision lock operations. First argument is name (N)
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* associated with implementation and the second is a pointer to
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* the type specified above (T).
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*/
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#define CK_ELIDE_LOCK(NAME, LOCK) ck_elide_##NAME##_lock(LOCK)
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#define CK_ELIDE_UNLOCK(NAME, LOCK) ck_elide_##NAME##_unlock(LOCK)
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#define CK_ELIDE_TRYLOCK(NAME, LOCK) ck_elide_##NAME##_trylock(LOCK)
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#endif /* _CK_ELIDE_H */
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