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move things around
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Wim Taymans
parent
847cef83b6
commit
d1655196c3
130 changed files with 363 additions and 335 deletions
216
src/modules/module-jack/shm.h
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216
src/modules/module-jack/shm.h
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/* This module provides a set of abstract shared memory interfaces
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* with support using both System V and POSIX shared memory
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* implementations. The code is divided into three sections:
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*
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* - common (interface-independent) code
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* - POSIX implementation
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* - System V implementation
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* - Windows implementation
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*
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* The implementation used is determined by whether USE_POSIX_SHM was
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* set in the ./configure step.
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*/
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/*
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Copyright (C) 2001-2003 Paul Davis
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Copyright (C) 2005-2012 Grame
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef __jack_shm_h__
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#define __jack_shm_h__
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#include <limits.h>
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#include <sys/types.h>
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#include <jack/types.h>
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#define TRUE 1
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#define FALSE 0
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#define MAX_SERVERS 8 /* maximum concurrent servers */
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#define MAX_SHM_ID 256 /* generally about 16 per server */
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#define JACK_SHM_MAGIC 0x4a41434b /* shm magic number: "JACK" */
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#define JACK_SHM_NULL_INDEX -1 /* NULL SHM index */
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#define JACK_SHM_REGISTRY_INDEX -2 /* pseudo SHM index for registry */
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/* On Mac OS X, SHM_NAME_MAX is the maximum length of a shared memory
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* segment name (instead of NAME_MAX or PATH_MAX as defined by the
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* standard).
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*/
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#ifdef USE_POSIX_SHM
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#ifndef NAME_MAX
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#define NAME_MAX 255
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#endif
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#ifndef SHM_NAME_MAX
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#define SHM_NAME_MAX NAME_MAX
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#endif
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typedef char shm_name_t[SHM_NAME_MAX];
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typedef shm_name_t jack_shm_id_t;
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#elif WIN32
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#define NAME_MAX 255
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#ifndef SHM_NAME_MAX
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#define SHM_NAME_MAX NAME_MAX
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#endif
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typedef char shm_name_t[SHM_NAME_MAX];
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typedef shm_name_t jack_shm_id_t;
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#elif __ANDROID__
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#ifndef NAME_MAX
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#define NAME_MAX 255
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#endif
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#ifndef SHM_NAME_MAX
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#define SHM_NAME_MAX NAME_MAX
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#endif
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typedef char shm_name_t[SHM_NAME_MAX];
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typedef shm_name_t jack_shm_id_t;
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typedef int jack_shm_fd_t;
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#else
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/* System V SHM */
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typedef int jack_shm_id_t;
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#endif /* SHM type */
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/* shared memory type */
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typedef enum {
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shm_POSIX = 1, /* POSIX shared memory */
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shm_SYSV = 2, /* System V shared memory */
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shm_WIN32 = 3, /* Windows 32 shared memory */
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shm_ANDROID = 4 /* Android shared memory */
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} jack_shmtype_t;
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typedef int16_t jack_shm_registry_index_t;
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/**
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* A structure holding information about shared memory allocated by
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* JACK. this persists across invocations of JACK, and can be used by
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* multiple JACK servers. It contains no pointers and is valid across
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* address spaces.
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*
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* The registry consists of two parts: a header including an array of
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* server names, followed by an array of segment registry entries.
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*/
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typedef struct _jack_shm_server {
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#ifdef WIN32
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int pid; /* process ID */
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#else
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pid_t pid; /* process ID */
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#endif
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char name[JACK_SERVER_NAME_SIZE];
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}
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jack_shm_server_t;
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typedef struct _jack_shm_header {
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uint32_t magic; /* magic number */
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uint16_t protocol; /* JACK protocol version */
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jack_shmtype_t type; /* shm type */
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jack_shmsize_t size; /* total registry segment size */
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jack_shmsize_t hdr_len; /* size of header */
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jack_shmsize_t entry_len; /* size of registry entry */
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jack_shm_server_t server[MAX_SERVERS]; /* current server array */
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}
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jack_shm_header_t;
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typedef struct _jack_shm_registry {
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jack_shm_registry_index_t index; /* offset into the registry */
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#ifdef WIN32
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int allocator; /* PID that created shm segment */
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#else
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pid_t allocator; /* PID that created shm segment */
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#endif
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jack_shmsize_t size; /* for POSIX unattach */
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jack_shm_id_t id; /* API specific, see above */
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#ifdef __ANDROID__
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jack_shm_fd_t fd;
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#endif
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}
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jack_shm_registry_t;
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#define JACK_SHM_REGISTRY_SIZE (sizeof (jack_shm_header_t) \
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+ sizeof (jack_shm_registry_t) * MAX_SHM_ID)
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/**
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* a structure holding information about shared memory
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* allocated by JACK. this version is valid only
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* for a given address space. It contains a pointer
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* indicating where the shared memory has been
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* attached to the address space.
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*/
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PRE_PACKED_STRUCTURE
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struct _jack_shm_info {
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jack_shm_registry_index_t index; /* offset into the registry */
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uint32_t size;
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#ifdef __ANDROID__
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jack_shm_fd_t fd;
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#endif
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union {
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void *attached_at; /* address where attached */
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char ptr_size[8];
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} ptr; /* a "pointer" that has the same 8 bytes size when compling in 32 or 64 bits */
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} POST_PACKED_STRUCTURE;
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typedef struct _jack_shm_info jack_shm_info_t;
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/* utility functions used only within JACK */
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void jack_shm_copy_from_registry (jack_shm_info_t*,
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jack_shm_registry_index_t);
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void jack_shm_copy_to_registry (jack_shm_info_t*,
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jack_shm_registry_index_t*);
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int jack_release_shm_info (jack_shm_registry_index_t);
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char* jack_shm_addr (jack_shm_info_t* si);
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// here begin the API
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int jack_register_server (const char *server_name, int new_registry);
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int jack_unregister_server (const char *server_name);
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int jack_initialize_shm (const char *server_name);
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int jack_initialize_shm_server (void);
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int jack_initialize_shm_client (void);
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int jack_cleanup_shm (void);
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int jack_shmalloc (const char *shm_name, jack_shmsize_t size,
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jack_shm_info_t* result);
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void jack_release_shm (jack_shm_info_t*);
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void jack_release_lib_shm (jack_shm_info_t*);
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void jack_destroy_shm (jack_shm_info_t*);
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int jack_attach_shm (jack_shm_info_t*);
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int jack_attach_lib_shm (jack_shm_info_t*);
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int jack_attach_shm_read (jack_shm_info_t*);
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int jack_attach_lib_shm_read (jack_shm_info_t*);
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int jack_resize_shm (jack_shm_info_t*, jack_shmsize_t size);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __jack_shm_h__ */
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