/usr/include/mpich/primitives/opa_emulated.h is in libmpich-dev 3.2-6build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
* (C) 2008 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
#ifndef OPA_EMULATED_H_INCLUDED
#define OPA_EMULATED_H_INCLUDED
/* Functions emulated using other atomics
This header should be included at the bottom of any atomic
primitives header that needs to implement an atomic op in terms of
another atomic.
*/
/* Emulating using LL/SC */
#if defined(OPA_LL_SC_SUPPORTED)
static _opa_inline int OPA_fetch_and_add_int_by_llsc(OPA_int_t *ptr, int val)
{
int prev;
do {
prev = OPA_LL_int(ptr);
} while (!OPA_SC_int(ptr, prev + val));
return prev;
}
static _opa_inline void OPA_add_int_by_llsc(OPA_int_t *ptr, int val)
{
OPA_fetch_and_add_int_by_llsc(ptr, val);
}
static _opa_inline void OPA_incr_int_by_llsc(OPA_int_t *ptr)
{
OPA_add_int_by_llsc(ptr, 1);
}
static _opa_inline void OPA_decr_int_by_llsc(OPA_int_t *ptr)
{
OPA_add_int_by_llsc(ptr, -1);
}
static _opa_inline int OPA_fetch_and_decr_int_by_llsc(OPA_int_t *ptr)
{
return OPA_fetch_and_add_int_by_llsc(ptr, -1);
}
static _opa_inline int OPA_fetch_and_incr_int_by_llsc(OPA_int_t *ptr)
{
return OPA_fetch_and_add_int_by_llsc(ptr, 1);
}
static _opa_inline int OPA_decr_and_test_int_by_llsc(OPA_int_t *ptr)
{
int prev = OPA_fetch_and_decr_int_by_llsc(ptr);
return prev == 1;
}
static _opa_inline void *OPA_cas_ptr_by_llsc(OPA_ptr_t *ptr, void *oldv, void *newv)
{
void *prev;
do {
prev = OPA_LL_ptr(ptr);
} while (prev == oldv && !OPA_SC_ptr(ptr, newv));
return prev;
}
static _opa_inline int OPA_cas_int_by_llsc(OPA_int_t *ptr, int oldv, int newv)
{
int prev;
do {
prev = OPA_LL_int(ptr);
} while (prev == oldv && !OPA_SC_int(ptr, newv));
return prev;
}
static _opa_inline void *OPA_swap_ptr_by_llsc(OPA_ptr_t *ptr, void *val)
{
void *prev;
do {
prev = OPA_LL_ptr(ptr);
} while (!OPA_SC_ptr(ptr, val));
return prev;
}
static _opa_inline int OPA_swap_int_by_llsc(OPA_int_t *ptr, int val)
{
int prev;
do {
prev = OPA_LL_int(ptr);
} while (!OPA_SC_int(ptr, val));
return prev;
}
#endif /* OPA_LL_SC_SUPPORTED */
static _opa_inline int OPA_fetch_and_add_int_by_cas(OPA_int_t *ptr, int val)
{
int cmp;
int prev = OPA_load_int(ptr);
do {
cmp = prev;
prev = OPA_cas_int(ptr, cmp, prev + val);
} while (prev != cmp);
return prev;
}
static _opa_inline int OPA_fetch_and_incr_int_by_faa(OPA_int_t *ptr)
{
return OPA_fetch_and_add_int(ptr, 1);
}
static _opa_inline int OPA_fetch_and_decr_int_by_faa(OPA_int_t *ptr)
{
return OPA_fetch_and_add_int(ptr, -1);
}
static _opa_inline int OPA_decr_and_test_int_by_fad(OPA_int_t *ptr)
{
return OPA_fetch_and_decr_int(ptr) == 1;
}
static _opa_inline void OPA_add_int_by_faa(OPA_int_t *ptr, int val)
{
OPA_fetch_and_add_int(ptr, val);
}
static _opa_inline int OPA_incr_int_by_faa(OPA_int_t *ptr)
{
return OPA_fetch_and_add_int(ptr, 1);
}
static _opa_inline void OPA_incr_int_by_add(OPA_int_t *ptr)
{
OPA_add_int(ptr, 1);
}
static _opa_inline void OPA_incr_int_by_fai(OPA_int_t *ptr)
{
OPA_fetch_and_incr_int(ptr);
}
static _opa_inline int OPA_decr_int_by_faa(OPA_int_t *ptr)
{
return OPA_fetch_and_add_int(ptr, -1);
}
static _opa_inline void OPA_decr_int_by_add(OPA_int_t *ptr)
{
OPA_add_int(ptr, -1);
}
static _opa_inline void OPA_decr_int_by_fad(OPA_int_t *ptr)
{
OPA_fetch_and_decr_int(ptr);
}
/* Swap using CAS */
static _opa_inline void *OPA_swap_ptr_by_cas(OPA_ptr_t *ptr, void *val)
{
void *cmp;
void *prev = OPA_load_ptr(ptr);
do {
cmp = prev;
prev = OPA_cas_ptr(ptr, cmp, val);
} while (prev != cmp);
return prev;
}
static _opa_inline int OPA_swap_int_by_cas(OPA_int_t *ptr, int val)
{
int cmp;
int prev = OPA_load_int(ptr);
do {
cmp = prev;
prev = OPA_cas_int(ptr, cmp, val);
} while (prev != cmp);
return prev;
}
#endif /* OPA_EMULATED_H_INCLUDED */
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