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ck_array.h
(3.06 KB)
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ck_backoff.h
(1.84 KB)
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ck_barrier.h
(5.31 KB)
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ck_bitmap.h
(12.25 KB)
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ck_brlock.h
(6.47 KB)
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ck_bytelock.h
(5.3 KB)
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ck_cc.h
(3.68 KB)
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ck_cohort.h
(5.64 KB)
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ck_elide.h
(8.74 KB)
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ck_epoch.h
(7.82 KB)
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ck_fifo.h
(12.87 KB)
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ck_hp.h
(3.31 KB)
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ck_hp_fifo.h
(5.99 KB)
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ck_hp_stack.h
(3.08 KB)
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ck_hs.h
(4.46 KB)
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ck_ht.h
(6.51 KB)
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ck_limits.h
(1.77 KB)
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ck_malloc.h
(1.57 KB)
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ck_md.h
(3.91 KB)
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ck_pflock.h
(3.68 KB)
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ck_pr.h
(31.64 KB)
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ck_queue.h
(15.78 KB)
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ck_rhs.h
(4.41 KB)
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ck_ring.h
(16.8 KB)
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ck_rwcohort.h
(11.17 KB)
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ck_rwlock.h
(6.15 KB)
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ck_sequence.h
(3.35 KB)
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ck_spinlock.h
(2.46 KB)
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ck_stack.h
(9.03 KB)
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ck_stdbool.h
(1.42 KB)
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ck_stddef.h
(1.42 KB)
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ck_stdint.h
(1.55 KB)
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ck_stdlib.h
(1.42 KB)
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ck_string.h
(1.42 KB)
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ck_swlock.h
(5.09 KB)
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ck_tflock.h
(3.9 KB)
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gcc
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spinlock
Editing: ck_swlock.h
/* * Copyright 2014 Jaidev Sridhar. * Copyright 2014 Samy Al Bahra. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef CK_SWLOCK_H #define CK_SWLOCK_H #include <ck_elide.h> #include <ck_limits.h> #include <ck_pr.h> #include <ck_stdbool.h> #include <ck_stddef.h> struct ck_swlock { uint32_t value; }; typedef struct ck_swlock ck_swlock_t; #define CK_SWLOCK_INITIALIZER {0} #define CK_SWLOCK_WRITER_BIT (1UL << 31) #define CK_SWLOCK_LATCH_BIT (1UL << 30) #define CK_SWLOCK_WRITER_MASK (CK_SWLOCK_LATCH_BIT | CK_SWLOCK_WRITER_BIT) #define CK_SWLOCK_READER_MASK (UINT32_MAX ^ CK_SWLOCK_WRITER_MASK) CK_CC_INLINE static void ck_swlock_init(struct ck_swlock *rw) { rw->value = 0; ck_pr_barrier(); return; } CK_CC_INLINE static void ck_swlock_write_unlock(ck_swlock_t *rw) { ck_pr_fence_unlock(); ck_pr_and_32(&rw->value, CK_SWLOCK_READER_MASK); return; } CK_CC_INLINE static bool ck_swlock_locked_writer(ck_swlock_t *rw) { bool r; r = ck_pr_load_32(&rw->value) & CK_SWLOCK_WRITER_BIT; ck_pr_fence_acquire(); return r; } CK_CC_INLINE static void ck_swlock_write_downgrade(ck_swlock_t *rw) { ck_pr_inc_32(&rw->value); ck_swlock_write_unlock(rw); return; } CK_CC_INLINE static bool ck_swlock_locked(ck_swlock_t *rw) { bool r; r = ck_pr_load_32(&rw->value); ck_pr_fence_acquire(); return r; } CK_CC_INLINE static bool ck_swlock_write_trylock(ck_swlock_t *rw) { bool r; r = ck_pr_cas_32(&rw->value, 0, CK_SWLOCK_WRITER_BIT); ck_pr_fence_lock(); return r; } CK_ELIDE_TRYLOCK_PROTOTYPE(ck_swlock_write, ck_swlock_t, ck_swlock_locked, ck_swlock_write_trylock) CK_CC_INLINE static void ck_swlock_write_lock(ck_swlock_t *rw) { ck_pr_or_32(&rw->value, CK_SWLOCK_WRITER_BIT); while (ck_pr_load_32(&rw->value) & CK_SWLOCK_READER_MASK) ck_pr_stall(); ck_pr_fence_lock(); return; } CK_CC_INLINE static void ck_swlock_write_latch(ck_swlock_t *rw) { /* Publish intent to acquire lock. */ ck_pr_or_32(&rw->value, CK_SWLOCK_WRITER_BIT); /* Stall until readers have seen the writer and cleared. */ while (ck_pr_cas_32(&rw->value, CK_SWLOCK_WRITER_BIT, CK_SWLOCK_WRITER_MASK) == false) { do { ck_pr_stall(); } while (ck_pr_load_32(&rw->value) != CK_SWLOCK_WRITER_BIT); } ck_pr_fence_lock(); return; } CK_CC_INLINE static void ck_swlock_write_unlatch(ck_swlock_t *rw) { ck_pr_fence_unlock(); ck_pr_store_32(&rw->value, 0); return; } CK_ELIDE_PROTOTYPE(ck_swlock_write, ck_swlock_t, ck_swlock_locked, ck_swlock_write_lock, ck_swlock_locked_writer, ck_swlock_write_unlock) CK_ELIDE_TRYLOCK_PROTOTYPE(ck_swlock_read, ck_swlock_t, ck_swlock_locked_writer, ck_swlock_read_trylock) CK_CC_INLINE static bool ck_swlock_read_trylock(ck_swlock_t *rw) { uint32_t l = ck_pr_load_32(&rw->value); if (l & CK_SWLOCK_WRITER_BIT) return false; l = ck_pr_faa_32(&rw->value, 1) & CK_SWLOCK_WRITER_MASK; if (l == CK_SWLOCK_WRITER_BIT) ck_pr_dec_32(&rw->value); ck_pr_fence_lock(); return l == 0; } CK_CC_INLINE static void ck_swlock_read_lock(ck_swlock_t *rw) { uint32_t l; for (;;) { while (ck_pr_load_32(&rw->value) & CK_SWLOCK_WRITER_BIT) ck_pr_stall(); l = ck_pr_faa_32(&rw->value, 1) & CK_SWLOCK_WRITER_MASK; if (l == 0) break; /* * If the latch bit has not been set, then the writer would * have observed the reader and will wait to completion of * read-side critical section. */ if (l == CK_SWLOCK_WRITER_BIT) ck_pr_dec_32(&rw->value); } ck_pr_fence_lock(); return; } CK_CC_INLINE static bool ck_swlock_locked_reader(ck_swlock_t *rw) { ck_pr_fence_load(); return ck_pr_load_32(&rw->value) & CK_SWLOCK_READER_MASK; } CK_CC_INLINE static void ck_swlock_read_unlock(ck_swlock_t *rw) { ck_pr_fence_unlock(); ck_pr_dec_32(&rw->value); return; } CK_ELIDE_PROTOTYPE(ck_swlock_read, ck_swlock_t, ck_swlock_locked_writer, ck_swlock_read_lock, ck_swlock_locked_reader, ck_swlock_read_unlock) #endif /* CK_SWLOCK_H */
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