void
slaveLoop(void *id) {
int myid = *((int*)id);
int i, j, ret;
int local_sense = 0;
int total_iter=0;
long long int temp;
char localbuf[1024];
unsigned int input_array[6];
int mybinding;
unsigned long long c;
emptyPage_t** pagesVector;
tm_bind_to_cabinet(myid+1);
Barrier(&local_sense, myid, num_threads);
if (myid == num_threads-1) {
set_handler_address();
set_log_base(myid);
int k = 0;
BEGIN_ESCAPE
while (1) {
while (!cleanus_counter);
for (c=0; c<num_threads+1; c++) {
memcntl(GlobalPagesVector[c], 8192, MC_SYNC, (caddr_t) (MS_SYNC|MS_INVALIDATE), 0, 0);
}
pthread_mutex_lock(&clean_mutex);
cleanus_counter = 0;
pthread_mutex_unlock(&clean_mutex);
}
END_ESCAPE
} else {
int main(int argc, char *argv[])
{
#if _lib_memcntl
/* advise larger stack size */
struct memcntl_mha mha;
mha.mha_cmd = MHA_MAPSIZE_STACK;
mha.mha_flags = 0;
mha.mha_pagesize = 64 * 1024;
(void)memcntl(NULL, 0, MC_HAT_ADVISE, (caddr_t)&mha, 0, 0);
#endif
sh_waitnotify((Shnote_f)0);
return(sh_main(argc, argv, (Shinit_f)0));
}
/*
* shmat interpose
*/
void *
shmat(int shmid, const void *shmaddr, int shmflag)
{
static caddr_t (*shmatfunc)() = NULL;
void *result;
int advice = -1;
struct shmid_ds mds;
#ifdef MADVDEBUG
int rc;
#else
/* LINTED */
int rc;
#endif
if (!shmatfunc) {
shmatfunc = (caddr_t (*)()) dlsym(RTLD_NEXT, "shmat");
assert(shmatfunc);
}
result = shmatfunc(shmid, shmaddr, shmflag);
/*
* Options ism, dism take precedence over option shm.
*/
if (advice_ism >= 0 && (shmflag & SHM_SHARE_MMU)) {
advice = advice_ism;
} else if (advice_dism >= 0 && (shmflag & SHM_PAGEABLE)) {
advice = advice_dism;
} else if (advice_shm >= 0) {
advice = advice_shm;
}
/*
* Apply advice if specified and shmat succeeded.
*/
if (advice >= 0 && result != (void *)-1) {
/* First determine segment size */
rc = shmctl(shmid, IPC_STAT, &mds);
MADVPRINT(4, (stderr, "shmctl rc %d errno %d\n",
strerror(errno)));
rc = memcntl(result, mds.shm_segsz, MC_ADVISE,
(caddr_t)(intptr_t)advice, 0, 0);
MADVPRINT(1, (stderr,
"shmat advice: 0x%x 0x%x %d, rc %d errno %d\n",
result, mds.shm_segsz, advice, rc, errno));
}
return (result);
}
static int
pgszset(size_t sz, uint_t flags)
{
struct memcntl_mha mpss;
int rc;
mpss.mha_cmd = (flags == MPSSHEAP) ?
MHA_MAPSIZE_BSSBRK: MHA_MAPSIZE_STACK;
mpss.mha_pagesize = sz;
mpss.mha_flags = 0;
rc = memcntl(NULL, 0, MC_HAT_ADVISE, (caddr_t)&mpss, 0, 0);
return (rc);
}
/*
* mmap interpose
*/
caddr_t
mmap(caddr_t addr, size_t len, int prot, int flags, int fd, off_t pos)
{
static caddr_t (*mmapfunc)() = NULL;
caddr_t result;
int advice = -1;
#ifdef MADVDEBUG
int rc;
#else
/* LINTED */
int rc;
#endif
if (!mmapfunc) {
mmapfunc = (caddr_t (*)()) dlsym(RTLD_NEXT, "mmap");
assert(mmapfunc);
}
result = mmapfunc(addr, len, prot, flags, fd, pos);
/*
* Option mapanon has highest precedence while option map
* has lowest precedence.
*/
if (advice_mapanon >= 0 && (flags & MAP_ANON)) {
advice = advice_mapanon;
} else if (advice_mapshared >= 0 && (flags & MAP_SHARED)) {
advice = advice_mapshared;
} else if (advice_mapprivate >= 0 && (flags & MAP_PRIVATE)) {
advice = advice_mapprivate;
} else if (advice_map >= 0) {
advice = advice_map;
}
/*
* Apply advice if specified and mmap succeeded.
*/
if (advice >= 0 && result != MAP_FAILED) {
rc = memcntl(result, len, MC_ADVISE,
(caddr_t)(intptr_t)advice, 0, 0);
MADVPRINT(1, (stderr,
"mmap advice: 0x%x 0x%x %d, rc %d errno %d\n",
result, len, advice, rc, errno));
}
return (result);
}
/*
* On systems that supports multiple page sizes we may reduce the
* number of TLB-misses by using the biggest available page size
*/
static int enable_large_pages ( void )
{
#if defined(HAVE_GETPAGESIZES) && defined(HAVE_MEMCNTL)
int ret = - 1;
size_t sizes[32];
int avail = getpagesizes (sizes, 32);
if ( avail != - 1 )
{
size_t max = sizes[0];
struct memcntl_mha arg = { 0 };
int ii;
for ( ii = 1; ii < avail; ++ ii )
{
if ( max < sizes[ii] )
{
max = sizes[ii];
}
}
arg.mha_flags = 0;
arg.mha_pagesize = max;
arg.mha_cmd = MHA_MAPSIZE_BSSBRK;
if ( memcntl (0, 0, MC_HAT_ADVISE, ( caddr_t ) & arg, 0, 0) == - 1 )
{
fprintf (stderr, "Failed to set large pages: %s\n",
strerror (errno));
fprintf (stderr, "Will use default page size\n");
}
else
{
ret = 0;
}
}
else
{
fprintf (stderr, "Failed to get supported pagesizes: %s\n",
strerror (errno));
fprintf (stderr, "Will use default page size\n");
}
return ret;
#else
return - 1;
#endif
}
static void
bigheap(void)
{
size_t big, *size;
int sizes;
struct memcntl_mha mha;
/*
* First, get the available pagesizes.
*/
if ((sizes = getpagesizes(NULL, 0)) == -1)
return;
if (sizes == 1 || (size = alloca(sizeof (size_t) * sizes)) == NULL)
return;
if (getpagesizes(size, sizes) == -1)
return;
while (size[sizes - 1] > maxpgsize)
sizes--;
/* set big to the largest allowed page size */
big = size[sizes - 1];
if (big & (big - 1)) {
/*
* The largest page size is not a power of two for some
* inexplicable reason; return.
*/
return;
}
/*
* Now, align our break to the largest page size.
*/
if (brk((void *)((((uintptr_t)sbrk(0) - 1) & ~(big - 1)) + big)) != 0)
return;
/*
* set the preferred page size for the heap
*/
mha.mha_cmd = MHA_MAPSIZE_BSSBRK;
mha.mha_flags = 0;
mha.mha_pagesize = big;
(void) memcntl(NULL, 0, MC_HAT_ADVISE, (caddr_t)&mha, 0, 0);
}
int
main(void)
{
void *buf;
pid_t child;
int ret, i;
siginfo_t info;
uint8_t *ubuf;
size_t mapsz = sysconf(_SC_PAGESIZE) * 2;
buf = mmap(NULL, mapsz, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
assert(buf != MAP_FAILED);
ret = memcntl(buf, mapsz, MC_INHERIT_ZERO, 0, 0, 0);
assert(ret == 0);
again:
memset(buf, 'a' + nchild, mapsz);
child = fork();
if (child == 0) {
nchild--;
for (i = 0, ubuf = buf; i < mapsz; i++)
assert(ubuf[i] == 0);
if (nchild != 0)
goto again;
exit(0);
}
assert(child != -1);
do {
ret = waitid(P_PID, child, &info, WEXITED);
} while (ret == -1 && errno == EINTR);
assert(ret == 0);
assert(info.si_pid == child);
assert(info.si_status == 0);
for (i = 0, ubuf = buf; i < mapsz; i++)
assert(ubuf[i] == 'a' + nchild);
return (0);
}
static void
__madvmain()
{
char *cfgfile, *errfile;
FILE *fp = NULL;
const char *execname;
char *cwd;
int cwdlen;
char *tok, *tokadv, *tokarg;
char *str, *envadv;
int lineno = 0;
int advice;
uintptr_t brkbase, brkend;
size_t brksize;
int rc;
char *locale;
/*
* If a private error file is indicated then set the locale
* for error messages for the duration of this routine.
* Error messages destined for syslog should not be translated
* and thus come from the default C locale.
*/
if ((errfile = getenv(ENV_MADVERRFILE)) != NULL) {
errfp = fopen(errfile, "aF");
if (errfp) {
locale = setlocale(LC_MESSAGES, "");
} else {
madverr(NULL, dgettext(TEXT_DOMAIN,
"%s: cannot open error file: %s [%s]\n"),
madvident, errfile, strerror(errno));
}
}
#ifdef MADVDEBUG
if (str = getenv(ENV_MADVDEBUG))
madvdebug = atoi(str);
#endif
if (envadv = getenv(ENV_MADV)) {
if ((advice = strtoadv(envadv)) >= 0)
advice_all = advice;
else
madverr(errfp, dgettext(TEXT_DOMAIN,
"%s: invalid advice specified: MADV=%s\n"),
madvident, envadv);
}
/*
* Open specified cfg file or default one.
*/
if (cfgfile = getenv(ENV_MADVCFGFILE)) {
fp = fopen(cfgfile, "rF");
if (!fp) {
madverr(errfp, dgettext(TEXT_DOMAIN,
"%s: cannot open configuration file: %s [%s]\n"),
madvident, cfgfile, strerror(errno));
}
} else {
cfgfile = DEF_MADVCFGFILE;
fp = fopen(cfgfile, "rF");
}
if (fp) {
execname = mygetexecname();
cwd = getcwd(pbuf, MAXPATHLEN);
if (!cwd)
return;
cwd = strcat(cwd, "/");
cwdlen = strlen(cwd);
while (fgets(lbuf, MAXLINELEN, fp)) {
lineno++;
/*
* Make sure line wasn't truncated.
*/
if (strlen(lbuf) >= MAXLINELEN - 1) {
madverr(errfp, dgettext(TEXT_DOMAIN,
"%s: invalid entry, "
"line too long - cfgfile:"
" %s, line: %d\n"),
madvident, cfgfile, lineno);
continue;
}
if (empty(lbuf))
continue;
/*
* Get advice options.
* Parse right to left in case delimiter is in name.
*/
if (!(tokadv = strrchr(lbuf, CFGDELIMITER))) {
madverr(errfp, dgettext(TEXT_DOMAIN,
"%s: no delimiter specified - cfgfile:"
" %s, line: %d\n"),
madvident, cfgfile, lineno);
continue;
}
*tokadv++ = '\0';
/*
* Remove newline from end of advice options.
*/
if (str = strrchr(tokadv, '\n'))
*str = '\0';
/*
* Get optional argument string.
*/
if (tokarg = strrchr(lbuf, ARGDELIMITER)) {
*tokarg++ = '\0';
}
/*
* Compare exec name.
*/
tok = lbuf;
if (!fnmatch(execname, tok, cwd)) {
tokadv = tokarg = NULL;
cwd[cwdlen] = '\0';
continue;
}
/*
* Compare arguments if argument string specified.
*/
if (tokarg &&
!empty(tokarg) &&
!argmatch(tokarg)) {
tokadv = tokarg = NULL;
cwd[cwdlen] = '\0';
continue;
}
/*
* Parse advice options.
* If empty, any advice from ENV_MADV is reset.
*/
if (empty(tokadv)) {
advice_all = -1;
} else {
advice_opts(tokadv, execname, cfgfile, lineno);
}
break;
}
(void) fclose(fp);
}
/*
* Pagesize needed for proper aligning by brk interpose.
*/
pagesize = sysconf(_SC_PAGESIZE);
/*
* Apply global advice if set.
* Specific options in the cfgfile take precedence.
*/
if (advice_all >= 0) {
if (advice_heap < 0)
advice_heap = advice_all;
if (advice_shm < 0)
advice_shm = advice_all;
if (advice_map < 0)
advice_map = advice_all;
}
MADVPRINT(2, (stderr, "advice_all %d\n", advice_all));
MADVPRINT(2, (stderr, "advice_heap %d\n", advice_heap));
MADVPRINT(2, (stderr, "advice_shm %d\n", advice_shm));
MADVPRINT(2, (stderr, "advice_ism %d\n", advice_ism));
MADVPRINT(2, (stderr, "advice_dism %d\n", advice_dism));
MADVPRINT(2, (stderr, "advice_map %d\n", advice_map));
MADVPRINT(2, (stderr, "advice_mapshared %d\n", advice_mapshared));
MADVPRINT(2, (stderr, "advice_mapprivate %d\n", advice_mapprivate));
MADVPRINT(2, (stderr, "advice_mapanon %d\n", advice_mapanon));
/*
* If heap advice is specified, apply it to the existing heap.
* As the heap grows the kernel applies the advice automatically
* to new portions of the heap.
*/
if (advice_heap >= 0) {
if (rc = mygetbrk(&brkbase, &brksize)) {
madverr(errfp, dgettext(TEXT_DOMAIN,
"%s: /proc/self/status read failed [%s]\n"),
madvident, strerror(rc));
} else {
MADVPRINT(4, (stderr, "brkbase 0x%x brksize 0x%x\n",
brkbase, brksize));
/*
* Align start address for memcntl and apply advice
* on full pages of heap. Create a page of heap if
* it does not already exist.
*/
brkend = roundup(brkbase+brksize, pagesize);
brkbase = roundup(brkbase, pagesize);
brksize = brkend - brkbase;
if (brksize < pagesize) {
if (sbrk(pagesize) == (void *)-1) {
madverr(errfp, dgettext(TEXT_DOMAIN,
"%s: sbrk failed [%s]\n"),
madvident, strerror(errno));
goto out;
}
brksize = pagesize;
}
MADVPRINT(1, (stderr, "heap advice: 0x%x 0x%x %d\n",
brkbase, brksize, advice_heap));
if (memcntl((caddr_t)brkbase, brksize, MC_ADVISE,
(caddr_t)(intptr_t)advice_heap, 0, 0) < 0) {
madverr(errfp, dgettext(TEXT_DOMAIN,
"%s: memcntl() failed [%s]: heap advice\n"),
madvident, strerror(errno));
}
}
}
out:
if (errfp) {
(void) fclose(errfp);
(void) setlocale(LC_MESSAGES, locale);
} else {
/* close log file: no-op if nothing logged to syslog */
closelog();
}
}
int
munlock (const void *addr, size_t len)
{
return memcntl ((void*)addr, len, MC_UNLOCK, 0, 0, 0);
}
static void *alloc_hugetlb(void *address){
void *map_address = (void *)-1;
#if defined(OS_LINUX) || defined(OS_AIX)
int shmid;
shmid = shmget(IPC_PRIVATE, BUFFER_SIZE,
#ifdef OS_LINUX
SHM_HUGETLB |
#endif
#ifdef OS_AIX
SHM_LGPAGE | SHM_PIN |
#endif
IPC_CREAT | SHM_R | SHM_W);
if (shmid != -1) {
map_address = (void *)shmat(shmid, address, SHM_RND);
#ifdef OS_LINUX
my_mbind(map_address, BUFFER_SIZE, MPOL_PREFERRED, NULL, 0, 0);
#endif
if (map_address != (void *)-1){
shmctl(shmid, IPC_RMID, 0);
}
}
#endif
#ifdef __sun__
struct memcntl_mha mha;
mha.mha_cmd = MHA_MAPSIZE_BSSBRK;
mha.mha_flags = 0;
mha.mha_pagesize = HUGE_PAGESIZE;
memcntl(NULL, 0, MC_HAT_ADVISE, (char *)&mha, 0, 0);
map_address = (BLASULONG)memalign(HUGE_PAGESIZE, BUFFER_SIZE);
#endif
#ifdef OS_WINDOWS
HANDLE hToken;
TOKEN_PRIVILEGES tp;
if (OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES, &hToken) != TRUE) return (void *) -1;
tp.PrivilegeCount = 1;
tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
if (LookupPrivilegeValue(NULL, SE_LOCK_MEMORY_NAME, &tp.Privileges[0].Luid) != TRUE) return (void *) -1;
if (AdjustTokenPrivileges(hToken, FALSE, (PTOKEN_PRIVILEGES)&tp, 0, NULL, NULL) != TRUE) return (void *) -1;
map_address = (void *)VirtualAlloc(address,
BUFFER_SIZE,
MEM_LARGE_PAGES | MEM_RESERVE | MEM_COMMIT,
PAGE_READWRITE);
AdjustTokenPrivileges(hToken, TRUE, &tp, 0, (PTOKEN_PRIVILEGES)NULL, NULL);
if (map_address == (void *)NULL) map_address = (void *)-1;
#endif
if (map_address != (void *)-1){
release_info[release_pos].address = map_address;
release_info[release_pos].func = alloc_hugetlb_free;
release_pos ++;
}
return map_address;
}
int
madvise (__ptr_t addr, size_t len, int advice)
{
return memcntl (addr, len, MC_ADVISE, (caddr_t)(intptr_t)advice, 0, 0);
}
int
pr_memcntl(struct ps_prochandle *Pr,
caddr_t addr, size_t len, int cmd, caddr_t arg, int attr, int mask)
{
sysret_t rval; /* return value from memcntl() */
argdes_t argd[6]; /* arg descriptors for memcntl() */
argdes_t *adp;
int error;
if (Pr == NULL) /* no subject process */
return (memcntl(addr, len, cmd, arg, attr, mask));
adp = &argd[0]; /* addr argument */
adp->arg_value = (uintptr_t)addr;
adp->arg_object = NULL;
adp->arg_type = AT_BYVAL;
adp->arg_inout = AI_INPUT;
adp->arg_size = 0;
adp++; /* len argument */
adp->arg_value = len;
adp->arg_object = NULL;
adp->arg_type = AT_BYVAL;
adp->arg_inout = AI_INPUT;
adp->arg_size = 0;
adp++; /* cmd argument */
adp->arg_value = cmd;
adp->arg_object = NULL;
adp->arg_type = AT_BYVAL;
adp->arg_inout = AI_INPUT;
adp->arg_size = 0;
adp++; /* arg argument */
if (cmd == MC_HAT_ADVISE) {
adp->arg_value = 0;
adp->arg_object = arg;
adp->arg_type = AT_BYREF;
adp->arg_inout = AI_INPUT;
#ifdef _LP64
if (Pstatus(Pr)->pr_dmodel == PR_MODEL_ILP32)
adp->arg_size = sizeof (struct memcntl_mha32);
else
adp->arg_size = sizeof (struct memcntl_mha);
#else
adp->arg_size = sizeof (struct memcntl_mha);
#endif
} else {
adp->arg_value = (uintptr_t)arg;
adp->arg_object = NULL;
adp->arg_type = AT_BYVAL;
adp->arg_inout = AI_INPUT;
adp->arg_size = 0;
}
adp++; /* attr argument */
adp->arg_value = attr;
adp->arg_object = NULL;
adp->arg_type = AT_BYVAL;
adp->arg_inout = AI_INPUT;
adp->arg_size = 0;
adp++; /* mask argument */
adp->arg_value = mask;
adp->arg_object = NULL;
adp->arg_type = AT_BYVAL;
adp->arg_inout = AI_INPUT;
adp->arg_size = 0;
error = Psyscall(Pr, &rval, SYS_memcntl, 6, &argd[0]);
if (error) {
errno = (error > 0)? error : ENOSYS;
return (-1);
}
return (0);
}
w_rc_t sthread_t::set_bufsize_normal(
size_t size, char *&buf_start /* in/out*/, long system_page_size)
{
size_t requested_size = size; // save for asserts later
// ***********************************************************
//
// GET PAGE SIZES
//
// If the SM pagesize is larger than the largest system page size,
// align everything on the former (safe and is less confusing).
//
// ***********************************************************
long max_page_size = get_max_page_size(system_page_size);
w_assert1(system_page_size <= max_page_size);
long align_page_size = (SM_PAGESIZE > max_page_size)? SM_PAGESIZE : max_page_size;
// ***********************************************************
//
// GET FILE DESCRIPTOR FOR MMAP
//
// ***********************************************************
int fd(-1); // must be -1 if not mapping to a file
// ***********************************************************
//
// GET FLAGS FOR MMAP
//
// If posix mmapped file are available, _POSIX_MAPPED_FILES is defined
// in <unistd.h> to be > 0
//
// That should give you these flags:
// MAP_FIXED, MAP_PRIVATE, MAP_NORESERVE, MAP_ANONYMOUS
// If MAP_ANONYMOUS is not there, MAP_ANON might be.
//
// However... systems aren't exactly in sync here, so configure.ac
// checks for each of these flags.
//
// ***********************************************************
int flags1 = MAP_PRIVATE;
size_t extra_align = align_page_size;
size_t align_arg = 0;
#if HAVE_DECL_MAP_ANONYMOUS==1
flags1 |= MAP_ANONYMOUS;
#elif HAVE_DECL_MAP_ANON==1
flags1 |= MAP_ANON;
#else
#endif
#if HAVE_DECL_MAP_NORESERVE==1
flags1 |= MAP_NORESERVE;
#endif
#if HAVE_DECL_MAP_ALIGN==1
flags1 |= MAP_ALIGN;
extra_align = 0;
align_arg = align_page_size;
#endif
// add the extra alignment to the size requested before alignment,
// and then do our own alignment at the end In the case of
// MAP_ALIGN this is unnecessary, and the extra alignment is zero.
size += extra_align;
align_bufsize(size, system_page_size, align_page_size);
// ***********************************************************
//
// FIRST MMAP: get a mapped region from the kernel.
// If we are using hugetlbfs, fd will be >= 0 and
// we won't have to do the remap -- the first mapping will
// give us the best page sizes we can get. In that case,
// skip the first mmap and do exactly one "second mmap"
//
// ***********************************************************
errno = 0;
_disk_buffer = (char*) mmap((char*)align_arg, _disk_buffer_size,
PROT_NONE,
flags1,
fd, /* fd */
0 /* off_t */
);
if (_disk_buffer == MAP_FAILED) {
std::cerr
<< __LINE__ << " "
<< "mmap (size=" << _disk_buffer_size
<< " = " << int(_disk_buffer_size/1024)
<< " KB ) returns " << long(_disk_buffer)
<< " errno is " << errno << " " << strerror(errno)
<< " flags " << flags1
<< " fd " << fd
<< std::endl;
return RC(fcMMAPFAILED);
}
#if W_DEBUG_LEVEL > 4
else
{
std::cerr
<< __LINE__ << " "
<< "mmap SUCCESS! (size=" << _disk_buffer_size
<< " = " << int(_disk_buffer_size/1024)
<< " KB ) returns " << long(_disk_buffer)
<< " errno is " << errno << " " << strerror(errno)
<< " flags " << flags1
<< " fd " << fd
<< std::endl;
}
#endif
// ***********************************************************
//
// RE-MMAP: manually align the region and give the useful part R/W
// permissions.
//
// ***********************************************************
_disk_buffer = (char*)alignon(_disk_buffer, align_page_size);
alignon(requested_size, system_page_size);
if (mprotect(_disk_buffer, requested_size, PROT_READ|PROT_WRITE)) {
std::cerr
<< __LINE__ << " "
<< "mprotect (addr=" << long(_disk_buffer)
<< ", size=" << requested_size << ") returns -1;"
<< " errno is " << errno << " " << strerror(errno)
<< std::endl;
do_unmap();
return RC(fcMMAPFAILED);
}
#ifdef HAVE_MEMCNTL
struct memcntl_mha info;
info.mha_cmd = MHA_MAPSIZE_VA;
info.mha_flags = 0;
info.mha_pagesize = max_page_size;
// Ask the kernel to use the max page size here
if(memcntl(_disk_buffer, requested_size, MC_HAT_ADVISE, (char *)&info, 0, 0) < 0)
{
std::cerr << "memcntl returns -1;"
<< " errno is " << errno << " " << strerror(errno)
<< " requested size " << max_page_size << std::endl;
}
#endif
align_for_sm(requested_size);
buf_start = _disk_buffer;
clear(buf_start, requested_size);
return RCOK;
}
/*
* plock
*/
int
plock(int op) /* desired operation */
{
int e; /* return value */
pid_t pid; /* current pid */
lmutex_lock(&plock_lock);
/*
* Validate state of lock's. If parent has forked, then
* the lock state needs to be reset (children do not inherit
* memory locks, and thus do not inherit their state).
*/
if ((pid = getpid()) != state_pid) {
lock_state = 0;
state_pid = pid;
}
/*
* Dispatch on operation. Note: plock and its relatives depend
* upon "op" being bit encoded.
*/
switch (op) {
/*
* UNLOCK: remove all memory locks. Requires that some be set!
*/
case UNLOCK:
if (lock_state == 0) {
errno = EINVAL;
lmutex_unlock(&plock_lock);
return (-1);
}
e = munlockall();
if (e) {
lmutex_unlock(&plock_lock);
return (-1);
} else {
lock_state = 0;
lmutex_unlock(&plock_lock);
return (0);
}
/*NOTREACHED*/
/*
* TXTLOCK: locks text segments.
*/
case TXTLOCK:
/*
* If a text or process lock is already set, then fail.
*/
if ((lock_state & TXTLOCK) || (lock_state & PROCLOCK)) {
errno = EINVAL;
lmutex_unlock(&plock_lock);
return (-1);
}
/*
* Try to apply the lock(s). If a failure occurs,
* memcntl backs them out automatically.
*/
e = memcntl(NULL, 0, MC_LOCKAS, (caddr_t)MCL_CURRENT,
PROC_TEXT|PRIVATE, (int)NULL);
if (!e)
lock_state |= TXTLOCK;
lmutex_unlock(&plock_lock);
return (e);
/*NOTREACHED*/
/*
* DATLOCK: locks data segment(s), including the stack and all
* future growth in the address space.
*/
case DATLOCK:
/*
* If a data or process lock is already set, then fail.
*/
if ((lock_state & DATLOCK) || (lock_state & PROCLOCK)) {
errno = EINVAL;
lmutex_unlock(&plock_lock);
return (-1);
}
/*
* Try to lock the data and stack segments. On failure
* memcntl undoes the locks internally.
*/
e = memcntl(NULL, 0, MC_LOCKAS, (caddr_t)MCL_CURRENT,
PROC_DATA|PRIVATE, (int)NULL);
if (e) {
lmutex_unlock(&plock_lock);
return (-1);
}
/* try to set a lock for all future mappings. */
e = mlockall(MCL_FUTURE);
/*
* If failures have occurred, back out the locks
* and return failure.
*/
if (e) {
e = errno;
(void) memcntl(NULL, 0, MC_UNLOCKAS,
(caddr_t)MCL_CURRENT, PROC_DATA|PRIVATE, (int)NULL);
errno = e;
lmutex_unlock(&plock_lock);
return (-1);
}
/*
* Data, stack, and growth have been locked. Set state
* and return success.
*/
lock_state |= DATLOCK;
lmutex_unlock(&plock_lock);
return (0);
/*NOTREACHED*/
/*
* PROCLOCK: lock everything, and all future things as well.
* There should be nothing locked when this is called.
*/
case PROCLOCK:
if (lock_state) {
errno = EINVAL;
lmutex_unlock(&plock_lock);
return (-1);
}
if (mlockall(MCL_CURRENT | MCL_FUTURE) == 0) {
lock_state |= PROCLOCK;
lmutex_unlock(&plock_lock);
return (0);
} else {
lmutex_unlock(&plock_lock);
return (-1);
}
/*NOTREACHED*/
/*
* Invalid operation.
*/
default:
errno = EINVAL;
lmutex_unlock(&plock_lock);
return (-1);
/*NOTREACHED*/
}
}
int
mlockall(int flags)
{
return (memcntl(0, 0, MC_LOCKAS, (caddr_t)(uintptr_t)flags, 0, 0));
}
