mirror of
https://github.com/reactos/wine.git
synced 2024-11-29 06:30:37 +00:00
284 lines
7.2 KiB
C
284 lines
7.2 KiB
C
/***************************************************************************
|
|
* Copyright 1995, Technion, Israel Institute of Technology
|
|
* Electrical Eng, Software Lab.
|
|
* Author: Michael Veksler.
|
|
***************************************************************************
|
|
* File: dde_mem.c
|
|
* Purpose : shared DDE memory functionality for DDE
|
|
***************************************************************************
|
|
*/
|
|
#ifdef CONFIG_IPC
|
|
|
|
#include <assert.h>
|
|
#include "debug.h"
|
|
#include "ldt.h"
|
|
#include "shm_main_blk.h"
|
|
#include "shm_fragment.h"
|
|
#include "shm_semaph.h"
|
|
#include "dde_mem.h"
|
|
#include "bit_array.h"
|
|
|
|
#define SEGPTR2HANDLE_INFO(sptr) ( (struct handle_info*)PTR_SEG_TO_LIN(sptr) )
|
|
|
|
#define HINFO2DATAPTR(h_info_ptr) ( (void*) ( (char*)h_info_ptr + \
|
|
sizeof(struct handle_info) ) )
|
|
#define DDE_MEM_IDX(handle) ((handle)& 0x7fff)
|
|
#define DDE_MEM_HANDLE(idx) ((idx) | 0x8000)
|
|
#define DDE_MEM_INFO(handle) (main_block->handles[ DDE_MEM_IDX(handle) ])
|
|
/* List of shared handles.
|
|
* This entry resides on the shared memory, the data comes right
|
|
* after the `handle_info'.
|
|
* The entry is on the same block as the actual data.
|
|
* The `next' field gives relative reference (relative to the start of
|
|
* the blcok.
|
|
*/
|
|
struct handle_info {
|
|
WORD lock_count;
|
|
WORD flags;
|
|
int size; /* size of the data (net)*/
|
|
};
|
|
|
|
static bit_array free_handles;
|
|
int debug_last_handle_size= 0; /* for debugging purpose only */
|
|
|
|
|
|
/* locate_handle:
|
|
* locate a shared memory handle.
|
|
* Application:
|
|
* The handle is first searched for in attached blocks.
|
|
* At the beginning, only blocks owned by this process are
|
|
* attached.
|
|
* If a handle is not found, new blocks are attached.
|
|
* Arguments:
|
|
* h - the handle.
|
|
* RETURN: pointer to handle info.
|
|
*/
|
|
static struct handle_info *locate_handle(HGLOBAL16 h, struct local_shm_map *map)
|
|
{
|
|
struct shm_block *block;
|
|
|
|
TRACE(global,"shm: (0x%04x)\n", h);
|
|
|
|
|
|
if (SampleBit( &free_handles, DDE_MEM_IDX(h)) == 0) {
|
|
TRACE(global, "shm: return NULL\n");
|
|
return NULL; /* free!!! */
|
|
}
|
|
|
|
block= shm_locate_block(DDE_MEM_INFO(h).shmid, map);
|
|
if (block == NULL) {
|
|
/* nothing found */
|
|
TRACE(global, "shm: return NULL\n");
|
|
return NULL;
|
|
}
|
|
|
|
return (struct handle_info *) REL2PTR(block, DDE_MEM_INFO(h).rel);
|
|
|
|
}
|
|
|
|
/* dde_alloc_handle: allocate shared DDE handle */
|
|
static HGLOBAL16 dde_alloc_handle()
|
|
{
|
|
int bit_nr;
|
|
|
|
bit_nr= AllocateBit( &free_handles);
|
|
|
|
if (bit_nr != -1)
|
|
return DDE_MEM_HANDLE(bit_nr);
|
|
|
|
TRACE(global,"dde_alloc_handle: no free DDE handle found\n");
|
|
return 0;
|
|
}
|
|
/**********************************************************************
|
|
* DDE_malloc
|
|
*/
|
|
void *
|
|
DDE_malloc(unsigned int flags, unsigned long size, SHMDATA *shmdata)
|
|
{
|
|
int shmid;
|
|
struct shm_block *block;
|
|
struct handle_info *h_info;
|
|
struct local_shm_map *curr;
|
|
HGLOBAL16 handle;
|
|
|
|
TRACE(global,"DDE_malloc flags %4X, size %ld\n", flags, size);
|
|
DDE_IPC_init(); /* make sure main shm block allocated */
|
|
|
|
shm_write_wait(main_block->proc[curr_proc_idx].sem);
|
|
|
|
/* Try to find fragment big enough for `size' */
|
|
/* iterate through all local shm blocks, and try to allocate
|
|
the fragment */
|
|
|
|
h_info= NULL;
|
|
for (curr= shm_map ; curr != NULL ; curr= curr->next) {
|
|
if (curr->proc_idx == curr_proc_idx) {
|
|
h_info= (struct handle_info *)
|
|
shm_FragPtrAlloc(curr->ptr, size+sizeof(struct handle_info));
|
|
if (h_info!=NULL) {
|
|
shmid= curr->shm_id;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (h_info == NULL) {
|
|
|
|
block= shm_create_block(0, size+sizeof(struct handle_info), &shmid);
|
|
if (block==NULL) {
|
|
shm_write_signal(main_block->proc[curr_proc_idx].sem);
|
|
return 0;
|
|
}
|
|
/* put the new block in the linked list */
|
|
block->next_shm_id= main_block->proc[curr_proc_idx].shmid;
|
|
main_block->proc[curr_proc_idx].shmid= shmid;
|
|
h_info= (struct handle_info *)
|
|
shm_FragPtrAlloc(block, size+sizeof(struct handle_info));
|
|
if (h_info==NULL) {
|
|
ERR(global,"BUG! unallocated fragment\n");
|
|
shm_write_signal(main_block->proc[curr_proc_idx].sem);
|
|
return 0;
|
|
}
|
|
} else {
|
|
block= curr->ptr;
|
|
}
|
|
|
|
/* Here we have an allocated fragment */
|
|
h_info->flags= flags;
|
|
h_info->lock_count= 0;
|
|
h_info->size= size;
|
|
handle= dde_alloc_handle();
|
|
|
|
if (handle) {
|
|
TRACE(global, "returning handle=0x%4x, ptr=0x%08lx\n",
|
|
(int)handle, (long) HINFO2DATAPTR(h_info));
|
|
DDE_MEM_INFO(handle).rel= PTR2REL(block, h_info);
|
|
DDE_MEM_INFO(handle).shmid= shmid;
|
|
}
|
|
else
|
|
WARN(global, "failed\n");
|
|
|
|
shm_write_signal(main_block->proc[curr_proc_idx].sem);
|
|
|
|
shmdata->handle= handle;
|
|
return (char *)HINFO2DATAPTR(h_info);
|
|
}
|
|
|
|
HGLOBAL16 DDE_GlobalFree(HGLOBAL16 h)
|
|
{
|
|
struct handle_info *h_info;
|
|
int handle_index= h & 0x7fff;
|
|
struct local_shm_map map;
|
|
|
|
TRACE(global,"(0x%04x)\n",h);
|
|
|
|
if (h==0)
|
|
return 0;
|
|
|
|
h_info= locate_handle(h, &map);
|
|
if (h_info == NULL)
|
|
return h;
|
|
|
|
shm_write_wait(main_block->proc[map.proc_idx].sem);
|
|
|
|
shm_FragPtrFree(map.ptr, (struct shm_fragment *) h_info);
|
|
|
|
AssignBit( &free_handles, handle_index, 0);
|
|
|
|
/* FIXME: must free the shm block some day. */
|
|
shm_write_signal(main_block->proc[map.proc_idx].sem);
|
|
return 0;
|
|
}
|
|
|
|
WORD DDE_SyncHandle(HGLOBAL16 handle, WORD sel)
|
|
|
|
{
|
|
struct handle_info *h_info;
|
|
void *local_ptr;
|
|
ldt_entry entry;
|
|
|
|
h_info= locate_handle(handle, NULL);
|
|
local_ptr= (void *)GET_SEL_BASE(sel);
|
|
|
|
|
|
if (h_info == NULL)
|
|
return 0;
|
|
|
|
if (local_ptr == (void *) HINFO2DATAPTR(h_info))
|
|
return sel;
|
|
|
|
/* need syncronization ! */
|
|
LDT_GetEntry( SELECTOR_TO_ENTRY(sel), &entry );
|
|
entry.base= (unsigned long) HINFO2DATAPTR(h_info);
|
|
LDT_SetEntry( SELECTOR_TO_ENTRY(sel), &entry );
|
|
|
|
return sel;
|
|
}
|
|
|
|
/*
|
|
* DDE_AttachHandle:
|
|
* Attach shm memory (The data must not be already attached).
|
|
* Parameters:
|
|
* handle - the memory to attach.
|
|
* segptr - in not null, return SEGPTR to the same block.
|
|
* return value:
|
|
* 32 bit pointer to the memory.
|
|
*/
|
|
|
|
void *DDE_AttachHandle(HGLOBAL16 handle, SEGPTR *segptr)
|
|
{
|
|
struct handle_info *h_info;
|
|
SHMDATA shmdata;
|
|
void *ptr;
|
|
HGLOBAL16 hOwner = GetCurrentPDB16();
|
|
|
|
assert(is_dde_handle(handle));
|
|
if (segptr != NULL)
|
|
*segptr=0;
|
|
|
|
TRACE(global,"(%04x)\n",handle);
|
|
h_info=locate_handle(handle, NULL);
|
|
|
|
if (h_info == NULL)
|
|
return NULL;
|
|
|
|
if ( !(h_info->flags & GMEM_DDESHARE) ) {
|
|
ERR(global,"Corrupted memory handle info\n");
|
|
return NULL;
|
|
}
|
|
|
|
TRACE(global,"h_info=%06lx\n",(long)h_info);
|
|
|
|
shmdata.handle= handle;
|
|
shmdata.shmid= DDE_MEM_INFO(handle).shmid;
|
|
|
|
ptr= HINFO2DATAPTR(h_info);
|
|
/* Allocate the selector(s) */
|
|
if (! GLOBAL_CreateBlock( h_info->flags, ptr, h_info->size, hOwner,
|
|
FALSE, FALSE, FALSE, &shmdata))
|
|
return NULL;
|
|
|
|
if (segptr != NULL)
|
|
*segptr= (SEGPTR)MAKELONG( 0, shmdata.sel);
|
|
|
|
if (TRACE_ON(dde))
|
|
debug_last_handle_size= h_info->size;
|
|
|
|
TRACE(global,"DDE_AttachHandle returns ptr=0x%08lx\n", (long)ptr);
|
|
|
|
return (LPSTR)ptr;
|
|
|
|
}
|
|
|
|
void DDE_mem_init()
|
|
{
|
|
int nr_of_bits;
|
|
|
|
shm_init();
|
|
|
|
nr_of_bits= BITS_PER_BYTE * sizeof(main_block->free_handles);
|
|
AssembleArray( &free_handles, main_block->free_handles, nr_of_bits);
|
|
}
|
|
|
|
#endif /* CONFIG_IPC */
|