279 lines
9.3 KiB
C
279 lines
9.3 KiB
C
/**********************************************************************
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The OPTYap Prolog system
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OPTYap extends the Yap Prolog system to support or-parallel tabling
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Copyright: R. Rocha and NCC - University of Porto, Portugal
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File: opt.memory.c
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version: $Id: opt.memory.c,v 1.10 2008-03-25 16:45:53 vsc Exp $
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**********************************************************************/
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/* -------------------------------------- **
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** Includes and local variables **
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** -------------------------------------- */
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#include "Yap.h"
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#ifdef YAPOR
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#include <signal.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/shm.h>
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#include <sys/mman.h>
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#include "Yatom.h"
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#include "YapHeap.h"
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#include "alloc.h"
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#include "heapgc.h"
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#define KBYTES 1024
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#ifdef MMAP_MEMORY_MAPPING_SCHEME
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int fd_mapfile;
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#else /* SHM_MEMORY_MAPPING_SCHEME */
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int shm_mapid[MAX_WORKERS + 1];
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#endif /* MEMORY_MAPPING_SCHEME */
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/* --------------------------- **
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** Global functions **
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** --------------------------- */
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#ifdef SHM_MEMORY_MAPPING_SCHEME
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void shm_map_memory(int id, int size, void *shmaddr) {
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#define SHMMAX 0x2000000 /* as in <asm/shmparam.h> */
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if (size > SHMMAX)
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Yap_Error(FATAL_ERROR, TermNil, "maximum size for a shm segment exceeded (shm_map_memory)");
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if ((shm_mapid[id] = shmget(IPC_PRIVATE, size, SHM_R|SHM_W)) == -1)
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Yap_Error(FATAL_ERROR, TermNil, "shmget error (shm_map_memory)");
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if (shmat(shm_mapid[id], shmaddr, 0) == (void *) -1)
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Yap_Error(FATAL_ERROR, TermNil, "shmat error (shm_map_memory)");
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return;
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}
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#else /* MMAP_MEMORY_MAPPING_SCHEME */
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void
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open_mapfile(long TotalArea) {
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char mapfile[20];
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strcpy(mapfile,"/tmp/mapfile");
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itos(getpid(), &mapfile[12]);
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if ((fd_mapfile = open(mapfile, O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0)
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Yap_Error(FATAL_ERROR, TermNil, "open error (open_mapfile)");
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if (lseek(fd_mapfile, TotalArea, SEEK_SET) < 0)
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Yap_Error(FATAL_ERROR, TermNil, "lseek error (open_mapfile)");
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if (write(fd_mapfile, "", 1) < 0)
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Yap_Error(FATAL_ERROR, TermNil, "write error (open_mapfile)");
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return;
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}
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void
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close_mapfile(void) {
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if (close(fd_mapfile) < 0)
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Yap_Error(FATAL_ERROR, TermNil, "close error (close_mapfile)");
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}
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#endif /* MMAP_MEMORY_MAPPING_SCHEME */
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void map_memory(long HeapArea, long GlobalLocalArea, long TrailAuxArea, int n_workers) {
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void *mmap_addr = (void *)MMAP_ADDR;
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#ifdef ACOW
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int private_fd_mapfile;
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#if MMAP_MEMORY_MAPPING_SCHEME
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long TotalArea;
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#endif /* MMAP_MEMORY_MAPPING_SCHEME */
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#else /* ENV_COPY || SBA */
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int i;
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long WorkerArea;
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long TotalArea;
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#endif /* YAPOR_MODEL */
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/* initial allocation - model independent */
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HeapArea = ADJUST_SIZE_TO_PAGE(HeapArea);
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GlobalLocalArea = ADJUST_SIZE(GlobalLocalArea);
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TrailAuxArea = ADJUST_SIZE(TrailAuxArea);
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/* we'll need this later */
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Yap_HeapBase = (ADDR)mmap_addr;
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Yap_GlobalBase = mmap_addr + HeapArea;
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/* shared memory allocation - model dependent */
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#ifdef ACOW
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/* acow just needs one stack */
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#ifdef MMAP_MEMORY_MAPPING_SCHEME
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/* I need this for MMAP to know what it must allocate */
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TotalArea = HeapArea;
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#endif /* MMAP_MEMORY_MAPPING_SCHEME */
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#else /* ENV_COPY || SBA */
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/* the others need n stacks */
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WorkerArea = ADJUST_SIZE_TO_PAGE(GlobalLocalArea + TrailAuxArea);
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TotalArea = HeapArea + WorkerArea * n_workers;
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#endif /* YAPOR_MODEL */
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/* mmap heap area */
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#ifdef MMAP_MEMORY_MAPPING_SCHEME
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/* map total area in a single go */
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open_mapfile(TotalArea);
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if ((mmap_addr = mmap((void *) MMAP_ADDR, (size_t) TotalArea, PROT_READ|PROT_WRITE,
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MAP_SHARED|MAP_FIXED, fd_mapfile, 0)) == (void *) -1)
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Yap_Error(FATAL_ERROR, TermNil, "mmap error (map_memory)");
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#else /* SHM_MEMORY_MAPPING_SCHEME */
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/* Most systems are limited regarding what we can allocate */
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#ifdef ACOW
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/* single shared segment in ACOW */
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shm_map_memory(0, HeapArea, mmap_addr);
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#else /* ENV_COPY || SBA */
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/* place as segment n otherwise (0..n-1 reserved for worker areas */
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shm_map_memory(n_workers, HeapArea, mmap_addr);
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#endif /* YAPOR_MODEL */
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#endif /* MEMORY_MAPPING_SCHEME */
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#ifdef ACOW
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/* just allocate local space for stacks */
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if ((private_fd_mapfile = open("/dev/zero", O_RDWR)) < 0)
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Yap_Error(FATAL_ERROR, TermNil, "open error (map_memory)");
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if (mmap(Yap_GlobalBase, GlobalLocalArea + TrailAuxArea, PROT_READ|PROT_WRITE,
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MAP_PRIVATE|MAP_FIXED, private_fd_mapfile, 0) == (void *) -1)
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Yap_Error(FATAL_ERROR, TermNil, "mmap error (map_memory)");
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close(private_fd_mapfile);
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#else /* ENV_COPY || SBA */
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for (i = 0; i < n_workers; i++) {
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/* initialize worker vars */
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worker_area(i) = Yap_GlobalBase + i * WorkerArea;
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worker_offset(i) = worker_area(i) - worker_area(0);
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#ifdef SHM_MEMORY_MAPPING_SCHEME
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/* mapping worker area */
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shm_map_memory(i, WorkerArea, worker_area(i));
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#endif /* SHM_MEMORY_MAPPING_SCHEME */
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}
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#endif /* YAPOR_MODEL */
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#ifdef SBA
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/* alloc space for the sparse binding array */
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sba_size = WorkerArea * n_workers;
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if ((binding_array = (char *)malloc(sba_size)) == NULL)
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Yap_Error(FATAL_ERROR, TermNil, "malloc error (map_memory)");
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if ((CELL)binding_array & MBIT) {
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Yap_Error(INTERNAL_ERROR, TermNil, "binding_array start address conflicts with tag used in IDB (map_memory)");
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}
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sba_offset = binding_array - Yap_GlobalBase;
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sba_end = (int)binding_array + sba_size;
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#endif /* SBA */
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Yap_TrailBase = Yap_GlobalBase + GlobalLocalArea;
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Yap_LocalBase = Yap_TrailBase - CellSize;
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if (TrailAuxArea > 262144) /* 262144 = 256 * 1024 */
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Yap_TrailTop = Yap_TrailBase + (TrailAuxArea - 131072); /* 131072 = 262144 / 2 */
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else
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Yap_TrailTop = Yap_TrailBase + (TrailAuxArea / 2);
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HeapMax = (CELL)(Yap_TrailBase + (TrailAuxArea - CellSize));
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Yap_InitHeap(mmap_addr);
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}
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void unmap_memory (void) {
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#ifdef SHM_MEMORY_MAPPING_SCHEME
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int i;
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#else /* MMAP_MEMORY_MAPPING_SCHEME */
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char MapFile[20];
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#endif /* MEMORY_MAPPING_SCHEME */
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{
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int proc;
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INFORMATION_MESSAGE("Worker %d exiting...", worker_id);
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for (proc = 0; proc < number_workers; proc++) {
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if (proc != worker_id && worker_pid(proc) != 0) {
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if (kill(worker_pid(proc), SIGKILL) != 0)
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INFORMATION_MESSAGE("Can't kill process %d", worker_pid(proc));
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else
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INFORMATION_MESSAGE("Killing process %d", worker_pid(proc));
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}
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}
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#ifdef ACOW
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if (number_workers > 1) {
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if (kill(GLOBAL_master_worker, SIGINT) != 0)
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INFORMATION_MESSAGE("Can't kill process %d", GLOBAL_master_worker);
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else
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INFORMATION_MESSAGE("Killing process %d", GLOBAL_master_worker);
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}
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#endif /* ACOW */
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}
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#ifdef SHM_MEMORY_MAPPING_SCHEME
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#ifdef ACOW
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i = 0;
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#else
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for (i = 0; i < number_workers + 1; i++)
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#endif /* ACOW */
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{
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if (shmctl(shm_mapid[i], IPC_RMID, 0) == 0)
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INFORMATION_MESSAGE("Removing shared memory segment %d", shm_mapid[i]);
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else INFORMATION_MESSAGE("Can't remove shared memory segment %d", shm_mapid[i]);
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}
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#else /* MMAP_MEMORY_MAPPING_SCHEME */
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strcpy(MapFile,"/tmp/mapfile");
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#ifdef ACOW
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itos(GLOBAL_master_worker, &MapFile[12]);
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#else /* ENV_COPY || SBA */
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itos(worker_pid(0), &MapFile[12]);
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#endif
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if (remove(MapFile) == 0)
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INFORMATION_MESSAGE("Removing mapfile \"%s\"", MapFile);
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else INFORMATION_MESSAGE("Can't remove mapfile \"%s\"", MapFile);
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#endif /* MEMORY_MAPPING_SCHEME */
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return;
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}
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void remap_memory(void) {
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#ifdef ACOW
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/* do nothing */
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#endif /* ACOW */
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#ifdef SBA
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/* setup workers so that they have different areas */
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long WorkerArea = worker_offset(1);
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Yap_GlobalBase += worker_id * WorkerArea;
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Yap_TrailBase += worker_id * WorkerArea;
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Yap_LocalBase += worker_id * WorkerArea;
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Yap_TrailTop += worker_id * WorkerArea;
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#endif /* SBA */
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#ifdef ENV_COPY
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void *remap_addr;
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long remap_offset;
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long WorkerArea;
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int i;
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remap_addr = worker_area(0);
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remap_offset = (char *)remap_addr - (char *)Yap_HeapBase;
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WorkerArea = worker_offset(1);
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#ifdef SHM_MEMORY_MAPPING_SCHEME
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for (i = 0; i < number_workers; i++) {
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if (shmdt(worker_area(i)) == -1)
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Yap_Error(FATAL_ERROR, TermNil, "shmdt error (remap_memory)");
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}
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for (i = 0; i < number_workers; i++) {
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worker_area(i) = remap_addr + ((number_workers + i - worker_id) % number_workers) * WorkerArea;
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if(shmat(shm_mapid[i], worker_area(i), 0) == (void *) -1)
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Yap_Error(FATAL_ERROR, TermNil, "shmat error (remap_memory)");
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}
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#else /* MMAP_MEMORY_MAPPING_SCHEME */
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if (munmap(remap_addr, (size_t)(WorkerArea * number_workers)) == -1)
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Yap_Error(FATAL_ERROR, TermNil, "munmap error (remap_memory)");
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for (i = 0; i < number_workers; i++) {
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worker_area(i) = remap_addr + ((number_workers + i - worker_id) % number_workers) * WorkerArea;
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if (mmap(worker_area(i), (size_t)WorkerArea, PROT_READ|PROT_WRITE,
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MAP_SHARED|MAP_FIXED, fd_mapfile, remap_offset + i * WorkerArea) == (void *) -1)
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Yap_Error(FATAL_ERROR, TermNil, "mmap error (remap_memory)");
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}
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#endif /* MEMORY_MAPPING_SCHEME */
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for (i = 0; i < number_workers; i++) {
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worker_offset(i) = worker_area(i) - worker_area(worker_id);
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}
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#endif /* ENV_COPY */
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}
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#endif /* YAPOR */
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