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jeremybenn |
/*
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* (c) Copyright 1990-1996 OPEN SOFTWARE FOUNDATION, INC.
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* (c) Copyright 1990-1996 HEWLETT-PACKARD COMPANY
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* (c) Copyright 1990-1996 DIGITAL EQUIPMENT CORPORATION
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* (c) Copyright 1991, 1992 Siemens-Nixdorf Information Systems
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* To anyone who acknowledges that this file is provided "AS IS" without
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* any express or implied warranty: permission to use, copy, modify, and
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* distribute this file for any purpose is hereby granted without fee,
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* provided that the above copyright notices and this notice appears in
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* all source code copies, and that none of the names listed above be used
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* in advertising or publicity pertaining to distribution of the software
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* without specific, written prior permission. None of these organizations
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* makes any representations about the suitability of this software for
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* any purpose.
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*/
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/*
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* Header file for stack management (internal to cma_stack.c, but
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* separate for convenience, and unit testing).
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*/
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#ifndef CMA_STACK_INT
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#define CMA_STACK_INT
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/*
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* INCLUDE FILES
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*/
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#include <cma.h>
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#include <cma_queue.h>
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#include <cma_list.h>
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#include <cma_tcb_defs.h>
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/*
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* CONSTANTS AND MACROS
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*/
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#define cma___c_first_free_chunk 0
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#define cma___c_min_count 2 /* Smallest number of chunks to leave */
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#define cma___c_end (-1) /* End of free list (flag) */
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#define cma__c_yellow_size 0
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/*
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* Cluster types
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*/
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#define cma___c_cluster 0 /* Default cluster */
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#define cma___c_bigstack 1 /* Looks like a cluster, but it's a stack */
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#define cma___c_null_cluster (cma___t_cluster *)cma_c_null_ptr
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/*
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* TYPEDEFS
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*/
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#ifndef __STDC__
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struct CMA__T_INT_STACK;
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#endif
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typedef cma_t_natural cma___t_index; /* Type for chunk index */
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typedef struct CMA___T_CLU_DESC {
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cma__t_list list; /* Queue element for cluster list */
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cma_t_integer type; /* Type of cluster */
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cma_t_address stacks;
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cma_t_address limit;
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} cma___t_clu_desc;
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typedef union CMA___T_MAP_ENTRY {
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struct {
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cma__t_int_tcb *tcb; /* TCB associated with stack chunk */
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struct CMA__T_INT_STACK *stack; /* Stack desc. ass. with stack chunk */
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} mapped;
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struct {
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cma___t_index size; /* Number of chunks in block */
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cma___t_index next; /* Next free block */
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} free;
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} cma___t_map_entry;
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/*
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* NOTE: It is VERY IMPORTANT that both cma___t_cluster and cma___t_bigstack
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* begin with the cma___t_clu_desc structure, as there is some code in the
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* stack manager that relies on being able to treat both as equivalent!
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*/
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typedef struct CMA___T_CLUSTER {
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cma___t_clu_desc desc; /* Describe this cluster */
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cma___t_map_entry map[cma__c_chunk_count]; /* thread map */
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cma___t_index free; /* First free chunk index */
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} cma___t_cluster;
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/*
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* NOTE: It is VERY IMPORTANT that both cma___t_cluster and cma___t_bigstack
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* begin with the cma___t_clu_desc structure, as there is some code in the
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* stack manager that relies on being able to treat both as equivalent!
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*/
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typedef struct CMA___T_BIGSTACK {
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cma___t_clu_desc desc; /* Describe this cluster */
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cma__t_int_tcb *tcb; /* TCB associated with stack */
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struct CMA__T_INT_STACK *stack; /* Stack desc. ass. with stack */
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cma_t_natural size; /* Size of big stack */
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cma_t_boolean in_use; /* Set if allocated */
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} cma___t_bigstack;
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#if _CMA_PROTECT_MEMORY_
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typedef struct CMA___T_INT_HOLE {
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cma__t_queue link; /* Link holes together */
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cma_t_boolean protected; /* Set when pages are protected */
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cma_t_address first; /* First protected byte */
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cma_t_address last; /* Last protected byte */
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} cma___t_int_hole;
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#endif
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typedef struct CMA__T_INT_STACK {
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cma__t_object header; /* Common header (sequence, type info */
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cma__t_int_attr *attributes; /* Backpointer to attr obj */
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cma___t_cluster *cluster; /* Stack's cluster */
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cma_t_address stack_base; /* base address of stack */
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cma_t_address yellow_zone; /* first address of yellow zone */
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cma_t_address last_guard; /* last address of guard pages */
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cma_t_natural first_chunk; /* First chunk allocated */
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cma_t_natural chunk_count; /* Count of chunks allocated */
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cma__t_int_tcb *tcb; /* TCB backpointer */
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#if _CMA_PROTECT_MEMORY_
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cma___t_int_hole hole; /* Description of hole */
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#endif
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} cma__t_int_stack;
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/*
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* GLOBAL DATA
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*/
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/*
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* INTERNAL INTERFACES
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*/
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#endif
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