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SHMEM: Fix Linux code to properly use built-in's and cleanup on shutdown

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As reported in #909
This commit is contained in:
Mark Pizzolato 2020-09-15 14:31:03 -07:00
parent 02f97392d4
commit 29b0e7f121
1 changed files with 10 additions and 5 deletions
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15
sim_shmem.c
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@ -1,6 +1,6 @@
/* sim_shmem.c: simulator shared memory library
Copyright (c) 2015-2016, Robert M Supnik
Copyright (c) 2015-2020, Robert M Supnik
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
@ -134,7 +134,7 @@ struct SHMEM {
t_stat sim_shmem_open (const char *name, size_t size, SHMEM **shmem, void **addr)
{
#ifdef HAVE_SHM_OPEN
#if defined (HAVE_SHM_OPEN) && defined (__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)
*shmem = (SHMEM *)calloc (1, sizeof(**shmem));
mode_t orig_mask;
@ -191,25 +191,30 @@ if ((*shmem)->shm_base == MAP_FAILED) {
*addr = (*shmem)->shm_base;
return SCPE_OK;
#else
*shmem = NULL;
return SCPE_NOFNC;
#endif
}
void sim_shmem_close (SHMEM *shmem)
{
#if defined (HAVE_SHM_OPEN)
if (shmem == NULL)
return;
if (shmem->shm_base != MAP_FAILED)
munmap (shmem->shm_base, shmem->shm_size);
if (shmem->shm_fd != -1)
if (shmem->shm_fd != -1) {
shm_unlink (shmem->shm_name);
close (shmem->shm_fd);
}
free (shmem->shm_name);
free (shmem);
#endif
}
int32 sim_shmem_atomic_add (int32 *p, int32 v)
{
#if defined (HAVE_GCC_SYNC_BUILTINS)
#if defined (__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)
return __sync_add_and_fetch((int *) p, v);
#else
return *p + v;
@ -218,7 +223,7 @@ return *p + v;
t_bool sim_shmem_atomic_cas (int32 *ptr, int32 oldv, int32 newv)
{
#if defined (HAVE_GCC_SYNC_BUILTINS)
#if defined (__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)
return __sync_bool_compare_and_swap (ptr, oldv, newv);
#else
if (*ptr == oldv) {