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116 lines
4.6 KiB
116 lines
4.6 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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// |
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// An earlier version of this file appeared in the companion webpage for |
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// "Frightening small children and disconcerting grown-ups: Concurrency |
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// in the Linux kernel" by Alglave, Maranget, McKenney, Parri, and Stern, |
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// which appeared in ASPLOS 2018. |
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// ONCE |
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READ_ONCE(X) __load{once}(X) |
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WRITE_ONCE(X,V) { __store{once}(X,V); } |
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// Release Acquire and friends |
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smp_store_release(X,V) { __store{release}(*X,V); } |
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smp_load_acquire(X) __load{acquire}(*X) |
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rcu_assign_pointer(X,V) { __store{release}(X,V); } |
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rcu_dereference(X) __load{once}(X) |
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smp_store_mb(X,V) { __store{once}(X,V); __fence{mb}; } |
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// Fences |
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smp_mb() { __fence{mb}; } |
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smp_rmb() { __fence{rmb}; } |
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smp_wmb() { __fence{wmb}; } |
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smp_mb__before_atomic() { __fence{before-atomic}; } |
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smp_mb__after_atomic() { __fence{after-atomic}; } |
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smp_mb__after_spinlock() { __fence{after-spinlock}; } |
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smp_mb__after_unlock_lock() { __fence{after-unlock-lock}; } |
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barrier() { __fence{barrier}; } |
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// Exchange |
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xchg(X,V) __xchg{mb}(X,V) |
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xchg_relaxed(X,V) __xchg{once}(X,V) |
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xchg_release(X,V) __xchg{release}(X,V) |
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xchg_acquire(X,V) __xchg{acquire}(X,V) |
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cmpxchg(X,V,W) __cmpxchg{mb}(X,V,W) |
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cmpxchg_relaxed(X,V,W) __cmpxchg{once}(X,V,W) |
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cmpxchg_acquire(X,V,W) __cmpxchg{acquire}(X,V,W) |
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cmpxchg_release(X,V,W) __cmpxchg{release}(X,V,W) |
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// Spinlocks |
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spin_lock(X) { __lock(X); } |
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spin_unlock(X) { __unlock(X); } |
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spin_trylock(X) __trylock(X) |
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spin_is_locked(X) __islocked(X) |
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// RCU |
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rcu_read_lock() { __fence{rcu-lock}; } |
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rcu_read_unlock() { __fence{rcu-unlock}; } |
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synchronize_rcu() { __fence{sync-rcu}; } |
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synchronize_rcu_expedited() { __fence{sync-rcu}; } |
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// SRCU |
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srcu_read_lock(X) __srcu{srcu-lock}(X) |
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srcu_read_unlock(X,Y) { __srcu{srcu-unlock}(X,Y); } |
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synchronize_srcu(X) { __srcu{sync-srcu}(X); } |
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synchronize_srcu_expedited(X) { __srcu{sync-srcu}(X); } |
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// Atomic |
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atomic_read(X) READ_ONCE(*X) |
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atomic_set(X,V) { WRITE_ONCE(*X,V); } |
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atomic_read_acquire(X) smp_load_acquire(X) |
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atomic_set_release(X,V) { smp_store_release(X,V); } |
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atomic_add(V,X) { __atomic_op(X,+,V); } |
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atomic_sub(V,X) { __atomic_op(X,-,V); } |
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atomic_inc(X) { __atomic_op(X,+,1); } |
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atomic_dec(X) { __atomic_op(X,-,1); } |
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atomic_add_return(V,X) __atomic_op_return{mb}(X,+,V) |
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atomic_add_return_relaxed(V,X) __atomic_op_return{once}(X,+,V) |
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atomic_add_return_acquire(V,X) __atomic_op_return{acquire}(X,+,V) |
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atomic_add_return_release(V,X) __atomic_op_return{release}(X,+,V) |
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atomic_fetch_add(V,X) __atomic_fetch_op{mb}(X,+,V) |
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atomic_fetch_add_relaxed(V,X) __atomic_fetch_op{once}(X,+,V) |
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atomic_fetch_add_acquire(V,X) __atomic_fetch_op{acquire}(X,+,V) |
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atomic_fetch_add_release(V,X) __atomic_fetch_op{release}(X,+,V) |
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atomic_inc_return(X) __atomic_op_return{mb}(X,+,1) |
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atomic_inc_return_relaxed(X) __atomic_op_return{once}(X,+,1) |
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atomic_inc_return_acquire(X) __atomic_op_return{acquire}(X,+,1) |
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atomic_inc_return_release(X) __atomic_op_return{release}(X,+,1) |
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atomic_fetch_inc(X) __atomic_fetch_op{mb}(X,+,1) |
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atomic_fetch_inc_relaxed(X) __atomic_fetch_op{once}(X,+,1) |
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atomic_fetch_inc_acquire(X) __atomic_fetch_op{acquire}(X,+,1) |
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atomic_fetch_inc_release(X) __atomic_fetch_op{release}(X,+,1) |
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atomic_sub_return(V,X) __atomic_op_return{mb}(X,-,V) |
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atomic_sub_return_relaxed(V,X) __atomic_op_return{once}(X,-,V) |
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atomic_sub_return_acquire(V,X) __atomic_op_return{acquire}(X,-,V) |
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atomic_sub_return_release(V,X) __atomic_op_return{release}(X,-,V) |
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atomic_fetch_sub(V,X) __atomic_fetch_op{mb}(X,-,V) |
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atomic_fetch_sub_relaxed(V,X) __atomic_fetch_op{once}(X,-,V) |
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atomic_fetch_sub_acquire(V,X) __atomic_fetch_op{acquire}(X,-,V) |
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atomic_fetch_sub_release(V,X) __atomic_fetch_op{release}(X,-,V) |
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atomic_dec_return(X) __atomic_op_return{mb}(X,-,1) |
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atomic_dec_return_relaxed(X) __atomic_op_return{once}(X,-,1) |
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atomic_dec_return_acquire(X) __atomic_op_return{acquire}(X,-,1) |
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atomic_dec_return_release(X) __atomic_op_return{release}(X,-,1) |
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atomic_fetch_dec(X) __atomic_fetch_op{mb}(X,-,1) |
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atomic_fetch_dec_relaxed(X) __atomic_fetch_op{once}(X,-,1) |
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atomic_fetch_dec_acquire(X) __atomic_fetch_op{acquire}(X,-,1) |
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atomic_fetch_dec_release(X) __atomic_fetch_op{release}(X,-,1) |
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atomic_xchg(X,V) __xchg{mb}(X,V) |
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atomic_xchg_relaxed(X,V) __xchg{once}(X,V) |
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atomic_xchg_release(X,V) __xchg{release}(X,V) |
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atomic_xchg_acquire(X,V) __xchg{acquire}(X,V) |
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atomic_cmpxchg(X,V,W) __cmpxchg{mb}(X,V,W) |
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atomic_cmpxchg_relaxed(X,V,W) __cmpxchg{once}(X,V,W) |
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atomic_cmpxchg_acquire(X,V,W) __cmpxchg{acquire}(X,V,W) |
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atomic_cmpxchg_release(X,V,W) __cmpxchg{release}(X,V,W) |
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atomic_sub_and_test(V,X) __atomic_op_return{mb}(X,-,V) == 0 |
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atomic_dec_and_test(X) __atomic_op_return{mb}(X,-,1) == 0 |
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atomic_inc_and_test(X) __atomic_op_return{mb}(X,+,1) == 0 |
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atomic_add_negative(V,X) __atomic_op_return{mb}(X,+,V) < 0
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