/**************************************************************************** ** ** This file is part of GAP, a system for computational discrete algebra. ** ** Copyright of GAP belongs to its developers, whose names are too numerous ** to list here. Please refer to the COPYRIGHT file for details. ** ** SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef GAP_REGION_H #define GAP_REGION_H
#include"../common.h"
#ifndef HPCGAP #errorThis header is only meant to be used with HPC-GAP #endif
#include"atomic.h"
typedefstruct Region Region;
struct Region { void *lock; // void * so that we don't have to include pthread.h always
Bag obj; // references a unique T_REGION object per region
Bag name; // name of the region, or a null pointer Int prec; // locking precedence int fixed_owner; void *owner; // opaque thread descriptor void *alt_owner; // for paused threads int count_active; // whether we counts number of (contended) locks
AtomicUInt locks_acquired; // number of times the lock was acquired successfully
AtomicUInt locks_contended; // number of failed attempts at acuiring the lock unsignedchar readers[]; /* this field extends with number of threads
don't add any fields after it */
};
/**************************************************************************** ** *F NewRegion() . . . . . . . . . . . . . . . . allocate a new region
*/
Region *NewRegion(void);
/**************************************************************************** ** *F REGION(<bag>) . . . . . . . . return the region containing the bag *F RegionBag(<bag>) . . . . . . return the region containing the bag ** ** RegionBag() also contains a memory barrier.
*/
EXPORT_INLINE Region * REGION(Obj bag)
{ return ((Region **)bag)[1];
}
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