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refactor internal atomic.h
rather than having each arch provide its own atomic.h, there is a new shared atomic.h in src/internal which pulls arch-specific definitions from arc/$(ARCH)/atomic_arch.h. the latter can be extremely minimal, defining only a_cas or new ll/sc type primitives which the shared atomic.h will use to construct everything else. this commit avoids making heavy changes to the individual archs' atomic implementations. definitions which are identical or near-identical to what the new shared atomic.h would produce have been removed, but otherwise the changes made are just hooking up the arch-specific files to the new infrastructure. major changes to take advantage of the new system will come in subsequent commits.
This commit is contained in:
Rich Felker
275
src/internal/atomic.h
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275
src/internal/atomic.h
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#ifndef _ATOMIC_H
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#define _ATOMIC_H
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#include <stdint.h>
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#include "atomic_arch.h"
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#ifdef a_ll
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#ifndef a_pre_llsc
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#define a_pre_llsc()
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#endif
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#ifndef a_post_llsc
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#define a_post_llsc()
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#endif
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#ifndef a_cas
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#define a_cas a_cas
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static inline int a_cas(volatile int *p, int t, int s)
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{
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int old;
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a_pre_llsc();
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do old = a_ll(p);
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while (old==t && !a_sc(p, s));
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a_post_llsc();
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return old;
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}
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#endif
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#ifndef a_swap
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#define a_swap a_swap
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static inline int a_swap(volatile int *p, int v)
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{
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int old;
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a_pre_llsc();
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do old = a_ll(p);
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while (!a_sc(p, v));
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a_post_llsc();
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return old;
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}
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#endif
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#ifndef a_fetch_add
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#define a_fetch_add a_fetch_add
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static inline int a_fetch_add(volatile int *p, int v)
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{
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int old;
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a_pre_llsc();
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do old = a_ll(p);
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while (!a_sc(p, (unsigned)old + v));
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a_post_llsc();
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return old;
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}
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#endif
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#ifndef a_fetch_and
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#define a_fetch_and a_fetch_and
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static inline int a_fetch_and(volatile int *p, int v)
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{
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int old;
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a_pre_llsc();
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do old = a_ll(p);
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while (!a_sc(p, old & v));
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a_post_llsc();
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return old;
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}
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#endif
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#ifndef a_fetch_or
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#define a_fetch_or a_fetch_or
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static inline int a_fetch_or(volatile int *p, int v)
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{
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int old;
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a_pre_llsc();
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do old = a_ll(p);
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while (!a_sc(p, old | v));
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a_post_llsc();
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return old;
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}
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#endif
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#endif
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#ifndef a_cas
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#error missing definition of a_cas
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#endif
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#ifndef a_swap
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#define a_swap a_swap
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static inline int a_swap(volatile int *p, int v)
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{
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int old;
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do old = *p;
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while (a_cas(p, old, v) != old);
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return old;
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}
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#endif
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#ifndef a_fetch_add
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#define a_fetch_add a_fetch_add
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static inline int a_fetch_add(volatile int *p, int v)
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{
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int old;
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do old = *p;
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while (a_cas(p, old, (unsigned)old+v) != old);
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return old;
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}
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#endif
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#ifndef a_fetch_and
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#define a_fetch_and a_fetch_and
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static inline int a_fetch_and(volatile int *p, int v)
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{
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int old;
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do old = *p;
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while (a_cas(p, old, old&v) != old);
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return old;
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}
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#endif
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#ifndef a_fetch_or
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#define a_fetch_or a_fetch_or
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static inline int a_fetch_or(volatile int *p, int v)
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{
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int old;
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do old = *p;
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while (a_cas(p, old, old|v) != old);
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return old;
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}
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#endif
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#ifndef a_and
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#define a_and a_and
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static inline void a_and(volatile int *p, int v)
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{
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a_fetch_and(p, v);
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}
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#endif
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#ifndef a_or
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#define a_or a_or
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static inline void a_or(volatile int *p, int v)
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{
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a_fetch_or(p, v);
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}
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#endif
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#ifndef a_inc
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#define a_inc a_inc
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static inline void a_inc(volatile int *p)
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{
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a_fetch_add(p, 1);
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}
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#endif
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#ifndef a_dec
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#define a_dec a_dec
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static inline void a_dec(volatile int *p)
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{
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a_fetch_add(p, -1);
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}
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#endif
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#ifndef a_store
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#define a_store a_store
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static inline void a_store(volatile int *p, int v)
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{
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#ifdef a_barrier
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a_barrier();
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*p = v;
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a_barrier();
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#else
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a_swap(p, v);
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#endif
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}
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#endif
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#ifndef a_barrier
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#define a_barrier a_barrier
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static void a_barrier()
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{
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volatile int tmp = 0;
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a_cas(&tmp, 0, 0);
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}
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#endif
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#ifndef a_spin
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#define a_spin a_barrier
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#endif
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#ifndef a_and_64
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#define a_and_64 a_and_64
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static inline void a_and_64(volatile uint64_t *p, uint64_t v)
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{
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union { uint64_t v; uint32_t r[2]; } u = { v };
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if (u.r[0]+1) a_and((int *)p, u.r[0]);
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if (u.r[1]+1) a_and((int *)p+1, u.r[1]);
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}
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#endif
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#ifndef a_or_64
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#define a_or_64 a_or_64
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static inline void a_or_64(volatile uint64_t *p, uint64_t v)
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{
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union { uint64_t v; uint32_t r[2]; } u = { v };
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if (u.r[0]) a_or((int *)p, u.r[0]);
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if (u.r[1]) a_or((int *)p+1, u.r[1]);
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}
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#endif
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#ifndef a_cas_p
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#define a_cas_p a_cas_p
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static inline void *a_cas_p(volatile void *p, void *t, void *s)
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{
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return (void *)a_cas((volatile int *)p, (int)t, (int)s);
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}
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#endif
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#ifndef a_or_l
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#define a_or_l a_or_l
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static inline void a_or_l(volatile void *p, long v)
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{
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if (sizeof(long) == sizeof(int)) a_or(p, v);
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else a_or_64(p, v);
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}
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#endif
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#ifndef a_crash
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#define a_crash a_crash
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static inline void a_crash()
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{
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*(volatile char *)0=0;
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}
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#endif
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#ifndef a_ctz_64
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#define a_ctz_64 a_ctz_64
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static inline int a_ctz_64(uint64_t x)
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{
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static const char debruijn64[64] = {
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0, 1, 2, 53, 3, 7, 54, 27, 4, 38, 41, 8, 34, 55, 48, 28,
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62, 5, 39, 46, 44, 42, 22, 9, 24, 35, 59, 56, 49, 18, 29, 11,
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63, 52, 6, 26, 37, 40, 33, 47, 61, 45, 43, 21, 23, 58, 17, 10,
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51, 25, 36, 32, 60, 20, 57, 16, 50, 31, 19, 15, 30, 14, 13, 12
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};
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static const char debruijn32[32] = {
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0, 1, 23, 2, 29, 24, 19, 3, 30, 27, 25, 11, 20, 8, 4, 13,
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31, 22, 28, 18, 26, 10, 7, 12, 21, 17, 9, 6, 16, 5, 15, 14
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};
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if (sizeof(long) < 8) {
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uint32_t y = x;
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if (!y) {
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y = x>>32;
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return 32 + debruijn32[(y&-y)*0x076be629 >> 27];
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}
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return debruijn32[(y&-y)*0x076be629 >> 27];
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}
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return debruijn64[(x&-x)*0x022fdd63cc95386dull >> 58];
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}
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#endif
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#ifndef a_ctz_l
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#define a_ctz_l a_ctz_l
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static inline int a_ctz_l(unsigned long x)
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{
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static const char debruijn32[32] = {
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0, 1, 23, 2, 29, 24, 19, 3, 30, 27, 25, 11, 20, 8, 4, 13,
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31, 22, 28, 18, 26, 10, 7, 12, 21, 17, 9, 6, 16, 5, 15, 14
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};
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if (sizeof(long) == 8) return a_ctz_64(x);
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return debruijn32[(x&-x)*0x076be629 >> 27];
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}
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#endif
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#endif
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