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static ufixnum
data_pages(void) {
return page(2*(rb_end-rb_start)+((void *)heap_end-data_start));
}
#ifndef NO_FILE_LOCKING
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <errno.h>
static int pool=-1;
static struct pool {
ufixnum pid;
ufixnum n;
ufixnum s;
} *Pool;
static ufixnum pool_pid,pool_n,pool_s;
static struct flock f,pl,*plp=&pl;
static char gcl_pool[PATH_MAX];
static int
set_lock(void) {
errno=0;
if (fcntl(pool,F_SETLKW,plp))
return errno==EINTR ? set_lock() : -1;
return 0;
}
static void
lock_pool(void) {
pl.l_type=F_WRLCK;
massert(!set_lock());
}
static void
unlock_pool(void) {
pl.l_type=F_UNLCK;
massert(!set_lock());
}
static void
register_pool(int s) {
lock_pool();
Pool->n+=s;
Pool->s+=s*data_pages();
unlock_pool();
}
static void
open_pool(void) {
if (pool==-1) {
struct stat ss;
massert(!lstat(multiprocess_memory_pool,&ss));
massert(S_ISDIR(ss.st_mode));
massert(snprintf(gcl_pool,sizeof(gcl_pool),"%s%sgcl_pool",
multiprocess_memory_pool,
multiprocess_memory_pool[strlen(multiprocess_memory_pool)-1]=='/' ? "" : "/")>=0);
massert((pool=open(gcl_pool,O_CREAT|O_RDWR,0644))!=-1);
massert(!ftruncate(pool,sizeof(struct pool)));
massert((Pool=mmap(NULL,sizeof(struct pool),PROT_READ|PROT_WRITE,MAP_SHARED,pool,0))!=(void *)-1);
pl.l_type=F_WRLCK;
pl.l_whence=SEEK_SET;
pl.l_start=sizeof(Pool->pid);;
pl.l_len=0;
f=pl;
f.l_start=0;
f.l_len=sizeof(Pool->pid);
if (!fcntl(pool,F_SETLK,&f)) {
Pool->pid=getpid();
lock_pool();
Pool->n=0;
Pool->s=0;
unlock_pool();
}
f.l_type=F_RDLCK;
plp=&f;
massert(!set_lock());
plp=&pl;
register_pool(1);
massert(!atexit(close_pool));
}
}
#endif
void
close_pool(void) {
#ifndef NO_FILE_LOCKING
if (pool!=-1) {
f.l_type=F_WRLCK;
if (!fcntl(pool,F_SETLK,&f))
massert(!unlink(gcl_pool) || errno==ENOENT);
register_pool(-1);
massert(!close(pool));
massert(!munmap(Pool,sizeof(struct pool)));
pool=-1;
}
#endif
}
static void
update_pool(fixnum val) {
#ifndef NO_FILE_LOCKING
if (multiprocess_memory_pool) {
open_pool();
lock_pool();
Pool->s+=val;
unlock_pool();
}
#endif
}
static ufixnum
get_pool(void) {
ufixnum s;
#ifndef NO_FILE_LOCKING
if (multiprocess_memory_pool) {
open_pool();
lock_pool();
s=Pool->s;
unlock_pool();
} else
#endif
s=data_pages();
return s;
}
static void
pool_stat(void) {
#ifndef NO_FILE_LOCKING
if (multiprocess_memory_pool) {
open_pool();
lock_pool();
pool_pid=Pool->pid;
pool_n=Pool->n;
pool_s=Pool->s;
unlock_pool();
}
#endif
}
static void
pool_check(void) {
/* if (pool!=-1) */
/* massert(get_pool()==data_pages() */
/* ||!fprintf(stderr,"%lu %lu %lu\n",get_pool(),page((void *)heap_end-data_start),page(((rb_end-rb_start))))); */
}
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