#include <mono/io-layer/wapi-private.h>
#include <mono/io-layer/handles-private.h>
#include <mono/io-layer/shared.h>
-#include <mono/io-layer/collection.h>
#include <mono/io-layer/process-private.h>
#include <mono/utils/mono-os-mutex.h>
struct _WapiHandleSharedLayout *_wapi_shared_layout = NULL;
-/*
- * If SHM is enabled, this will point to shared memory, otherwise it will be NULL.
- */
-struct _WapiFileShareLayout *_wapi_fileshare_layout = NULL;
-
/*
* If SHM is disabled, this will point to a hash of _WapiFileShare structures, otherwise
* it will be NULL. We use this instead of _wapi_fileshare_layout to avoid allocating a
_wapi_shm_semaphores_remove ();
- _wapi_shm_detach (WAPI_SHM_DATA);
- _wapi_shm_detach (WAPI_SHM_FILESHARE);
+ g_free (_wapi_shared_layout);
if (file_share_hash) {
g_hash_table_destroy (file_share_hash);
} while(_wapi_fd_reserve > _wapi_private_handle_count);
_wapi_shm_semaphores_init ();
-
- _wapi_shared_layout = (_WapiHandleSharedLayout *)_wapi_shm_attach (WAPI_SHM_DATA);
+
+ _wapi_shared_layout = (_WapiHandleSharedLayout *)g_malloc0 (sizeof (_WapiHandleSharedLayout));
g_assert (_wapi_shared_layout != NULL);
-
- if (_wapi_shm_enabled ()) {
- /* This allocates a 4mb array, so do it only if SHM is enabled */
- _wapi_fileshare_layout = (_WapiFileShareLayout *)_wapi_shm_attach (WAPI_SHM_FILESHARE);
- g_assert (_wapi_fileshare_layout != NULL);
- }
-
-#if !defined (DISABLE_SHARED_HANDLES)
- if (_wapi_shm_enabled ())
- _wapi_collection_init ();
-#endif
+
_wapi_io_init ();
mono_os_mutex_init (&scan_mutex);
ref = _wapi_handle_new_shared (type, handle_specific);
if (ref == 0) {
- _wapi_handle_collect ();
ref = _wapi_handle_new_shared (type, handle_specific);
if (ref == 0) {
/* FIXME: grow the arrays */
DEBUG ("%s: Lookup for handle named [%s] type %s", __func__,
utf8_name, _wapi_handle_typename[type]);
- /* Do a handle collection before starting to look, so that any
- * stale cruft gets removed
- */
- _wapi_handle_collect ();
-
thr_ret = _wapi_handle_lock_shared_handles ();
g_assert (thr_ret == 0);
void
_wapi_free_share_info (_WapiFileShare *share_info)
{
- if (!_wapi_shm_enabled ()) {
- file_share_hash_lock ();
- g_hash_table_remove (file_share_hash, share_info);
- file_share_hash_unlock ();
- /* The hashtable dtor frees share_info */
- } else {
- memset (share_info, '\0', sizeof(struct _WapiFileShare));
- }
+ file_share_hash_lock ();
+ g_hash_table_remove (file_share_hash, share_info);
+ file_share_hash_unlock ();
+ /* The hashtable dtor frees share_info */
}
static gint
struct _WapiFileShare **share_info)
{
struct _WapiFileShare *file_share;
- guint32 now = (guint32)(time(NULL) & 0xFFFFFFFF);
- int thr_ret, i, first_unused = -1;
+ int thr_ret;
gboolean exists = FALSE;
/* Prevents entries from expiring under us as we search
thr_ret = _wapi_shm_sem_lock (_WAPI_SHARED_SEM_FILESHARE);
g_assert (thr_ret == 0);
- if (!_wapi_shm_enabled ()) {
- _WapiFileShare tmp;
-
- /*
- * Instead of allocating a 4MB array, we use a hash table to keep track of this
- * info. This is needed even if SHM is disabled, to track sharing inside
- * the current process.
- */
- if (!file_share_hash) {
- file_share_hash = g_hash_table_new_full (wapi_share_info_hash, wapi_share_info_equal, NULL, g_free);
- mono_os_mutex_init_recursive (&file_share_hash_mutex);
- }
-
- tmp.device = device;
- tmp.inode = inode;
+ _WapiFileShare tmp;
- file_share_hash_lock ();
+ /*
+ * Instead of allocating a 4MB array, we use a hash table to keep track of this
+ * info. This is needed even if SHM is disabled, to track sharing inside
+ * the current process.
+ */
+ if (!file_share_hash) {
+ file_share_hash = g_hash_table_new_full (wapi_share_info_hash, wapi_share_info_equal, NULL, g_free);
+ mono_os_mutex_init_recursive (&file_share_hash_mutex);
+ }
- file_share = (_WapiFileShare *)g_hash_table_lookup (file_share_hash, &tmp);
- if (file_share) {
- *old_sharemode = file_share->sharemode;
- *old_access = file_share->access;
- *share_info = file_share;
-
- InterlockedIncrement ((gint32 *)&file_share->handle_refs);
- exists = TRUE;
- } else {
- file_share = g_new0 (_WapiFileShare, 1);
+ tmp.device = device;
+ tmp.inode = inode;
- file_share->device = device;
- file_share->inode = inode;
- file_share->opened_by_pid = _wapi_getpid ();
- file_share->sharemode = new_sharemode;
- file_share->access = new_access;
- file_share->handle_refs = 1;
- *share_info = file_share;
+ file_share_hash_lock ();
- g_hash_table_insert (file_share_hash, file_share, file_share);
- }
+ file_share = (_WapiFileShare *)g_hash_table_lookup (file_share_hash, &tmp);
+ if (file_share) {
+ *old_sharemode = file_share->sharemode;
+ *old_access = file_share->access;
+ *share_info = file_share;
- file_share_hash_unlock ();
+ InterlockedIncrement ((gint32 *)&file_share->handle_refs);
+ exists = TRUE;
} else {
- /* If a linear scan gets too slow we'll have to fit a hash
- * table onto the shared mem backing store
- */
- *share_info = NULL;
- for (i = 0; i <= _wapi_fileshare_layout->hwm; i++) {
- file_share = &_wapi_fileshare_layout->share_info[i];
+ file_share = g_new0 (_WapiFileShare, 1);
- /* Make a note of an unused slot, in case we need to
- * store share info
- */
- if (first_unused == -1 && file_share->handle_refs == 0) {
- first_unused = i;
- continue;
- }
-
- if (file_share->handle_refs == 0) {
- continue;
- }
-
- if (file_share->device == device &&
- file_share->inode == inode) {
- *old_sharemode = file_share->sharemode;
- *old_access = file_share->access;
- *share_info = file_share;
-
- /* Increment the reference count while we
- * still have sole access to the shared area.
- * This makes the increment atomic wrt
- * collections
- */
- InterlockedIncrement ((gint32 *)&file_share->handle_refs);
-
- exists = TRUE;
- break;
- }
- }
-
- if (!exists) {
- if (i == _WAPI_FILESHARE_SIZE && first_unused == -1) {
- /* No more space */
- } else {
- if (first_unused == -1) {
- file_share = &_wapi_fileshare_layout->share_info[++i];
- _wapi_fileshare_layout->hwm = i;
- } else {
- file_share = &_wapi_fileshare_layout->share_info[first_unused];
- }
-
- file_share->device = device;
- file_share->inode = inode;
- file_share->opened_by_pid = _wapi_getpid ();
- file_share->sharemode = new_sharemode;
- file_share->access = new_access;
- file_share->handle_refs = 1;
- *share_info = file_share;
- }
- }
+ file_share->device = device;
+ file_share->inode = inode;
+ file_share->opened_by_pid = _wapi_getpid ();
+ file_share->sharemode = new_sharemode;
+ file_share->access = new_access;
+ file_share->handle_refs = 1;
+ *share_info = file_share;
- if (*share_info != NULL) {
- InterlockedExchange ((gint32 *)&(*share_info)->timestamp, now);
- }
+ g_hash_table_insert (file_share_hash, file_share, file_share);
}
+
+ file_share_hash_unlock ();
thr_ret = _wapi_shm_sem_unlock (_WAPI_SHARED_SEM_FILESHARE);
g_print ("offset: 0x%x", shared->offset);
}
-
-void _wapi_handle_update_refs (void)
-{
- guint32 i, k;
- int thr_ret;
- guint32 now = (guint32)(time (NULL) & 0xFFFFFFFF);
-
- thr_ret = _wapi_handle_lock_shared_handles ();
- g_assert (thr_ret == 0);
-
- /* Prevent file share entries racing with us */
- thr_ret = _wapi_shm_sem_lock (_WAPI_SHARED_SEM_FILESHARE);
- g_assert(thr_ret == 0);
-
- thr_ret = mono_os_mutex_lock (&scan_mutex);
-
- for(i = SLOT_INDEX (0); i < _wapi_private_handle_slot_count; i++) {
- if (_wapi_private_handles [i]) {
- for (k = SLOT_OFFSET (0); k < _WAPI_HANDLE_INITIAL_COUNT; k++) {
- struct _WapiHandleUnshared *handle = &_wapi_private_handles [i][k];
-
- if (_WAPI_SHARED_HANDLE(handle->type)) {
- struct _WapiHandleShared *shared_data;
-
- DEBUG ("%s: (%d) handle 0x%x is SHARED (%s)", __func__, _wapi_getpid (), i * _WAPI_HANDLE_INITIAL_COUNT + k, _wapi_handle_typename[handle->type]);
-
- shared_data = &_wapi_shared_layout->handles[handle->u.shared.offset];
-
- DEBUG ("%s: (%d) Updating timestamp of handle 0x%x", __func__, _wapi_getpid (), handle->u.shared.offset);
-
- InterlockedExchange ((gint32 *)&shared_data->timestamp, now);
- } else if (handle->type == WAPI_HANDLE_FILE) {
- struct _WapiHandle_file *file_handle = &handle->u.file;
-
- DEBUG ("%s: (%d) handle 0x%x is FILE", __func__, _wapi_getpid (), i * _WAPI_HANDLE_INITIAL_COUNT + k);
-
- g_assert (file_handle->share_info != NULL);
-
- DEBUG ("%s: (%d) Inc refs on fileshare 0x%x", __func__, _wapi_getpid (), (file_handle->share_info - &_wapi_fileshare_layout->share_info[0]) / sizeof(struct _WapiFileShare));
-
- InterlockedExchange ((gint32 *)&file_handle->share_info->timestamp, now);
- }
- }
- }
- }
-
- thr_ret = mono_os_mutex_unlock (&scan_mutex);
- g_assert (thr_ret == 0);
-
- thr_ret = _wapi_shm_sem_unlock (_WAPI_SHARED_SEM_FILESHARE);
-
- _wapi_handle_unlock_shared_handles ();
-}
-
* (C) 2002-2006 Novell, Inc.
*/
-
#include <config.h>
#include <glib.h>
-#include <stdio.h>
-#include <fcntl.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <errno.h>
-#include <string.h>
-#include <unistd.h>
-
-#if defined(HAVE_SYS_SEM_H) && !(defined(__native_client__) && defined(__GLIBC__))
-# include <sys/sem.h>
-#else
-# define DISABLE_SHARED_HANDLES
-#endif
-
-#ifndef DISABLE_SHARED_HANDLES
-# include <sys/mman.h>
-# include <sys/ipc.h>
-# ifdef HAVE_SYS_UTSNAME_H
-# include <sys/utsname.h>
-# endif
-#endif
-#include <mono/io-layer/wapi.h>
#include <mono/io-layer/wapi-private.h>
#include <mono/io-layer/shared.h>
-#include <mono/io-layer/handles-private.h>
+#include <mono/utils/mono-os-mutex.h>
#define DEBUGLOG(...)
//#define DEBUGLOG(...) g_message(__VA_ARGS__);
-// Semaphores used when no-shared-memory use is in use
-
static mono_mutex_t noshm_sems[_WAPI_SHARED_SEM_COUNT];
-static gpointer wapi_storage [16];
-
-static void
-noshm_semaphores_init (void)
+void
+_wapi_shm_semaphores_init (void)
{
int i;
-
for (i = 0; i < _WAPI_SHARED_SEM_COUNT; i++)
mono_os_mutex_init (&noshm_sems [i]);
}
-static int
-noshm_sem_lock (int sem)
-{
- int ret;
-
- DEBUGLOG ("%s: locking nosem %d", __func__, sem);
-
- ret = mono_os_mutex_lock (&noshm_sems[sem]);
-
- return ret;
-}
-
-static int
-noshm_sem_trylock (int sem)
-{
- int ret;
-
- DEBUGLOG ("%s: trying to lock nosem %d", __func__, sem);
-
- ret = mono_os_mutex_trylock (&noshm_sems[sem]);
-
- return ret;
-}
-
-static int
-noshm_sem_unlock (int sem)
-{
- int ret;
-
- DEBUGLOG ("%s: unlocking nosem %d", __func__, sem);
-
- ret = mono_os_mutex_unlock (&noshm_sems[sem]);
-
- return ret;
-}
-
-#ifdef DISABLE_SHARED_HANDLES
-void
-_wapi_shm_semaphores_init (void)
-{
- noshm_semaphores_init ();
-}
-
void
_wapi_shm_semaphores_remove (void)
{
int
_wapi_shm_sem_lock (int sem)
{
- return noshm_sem_lock (sem);
-}
-
-int
-_wapi_shm_sem_trylock (int sem)
-{
- return noshm_sem_trylock (sem);
-}
-
-int
-_wapi_shm_sem_unlock (int sem)
-{
- return noshm_sem_unlock (sem);
-}
-
-gpointer
-_wapi_shm_attach (_wapi_shm_t type)
-{
- gpointer res;
-
- switch(type) {
- case WAPI_SHM_DATA:
- res = g_malloc0 (sizeof(struct _WapiHandleSharedLayout));
- break;
- case WAPI_SHM_FILESHARE:
- res = g_malloc0 (sizeof(struct _WapiFileShareLayout));
- break;
- default:
- g_error ("Invalid type in _wapi_shm_attach ()");
- return NULL;
- }
-
- wapi_storage [type] = res;
- return res;
-}
-
-void
-_wapi_shm_detach (_wapi_shm_t type)
-{
- g_free (wapi_storage [type]);
-}
-
-gboolean
-_wapi_shm_enabled_internal (void)
-{
- return FALSE;
-}
-
-#else /* DISABLE_SHARED_HANDLES */
-
-/*
- * Use POSIX shared memory if possible, it is simpler, and it has the advantage that
- * writes to the shared area does not need to be written to disk, avoiding spinning up
- * the disk every x secs on laptops.
- */
-#ifdef HAVE_SHM_OPEN
-#define USE_SHM 1
-#endif
-
-static gboolean _wapi_shm_disabled = TRUE;
-
-static gchar *
-_wapi_shm_base_name (_wapi_shm_t type)
-{
- gchar *name = NULL;
- gchar machine_name[256];
- const gchar *fake_name;
- struct utsname ubuf;
- int ret;
- int len;
-
- ret = uname (&ubuf);
- if (ret == -1) {
- ubuf.machine[0] = '\0';
- ubuf.sysname[0] = '\0';
- } else {
- g_strdelimit (ubuf.sysname, "/", '_');
- g_strdelimit (ubuf.machine, "/", '_');
- }
-
- fake_name = g_getenv ("MONO_SHARED_HOSTNAME");
- if (fake_name == NULL) {
- if (gethostname(machine_name, sizeof(machine_name)) != 0)
- machine_name[0] = '\0';
- } else {
- len = MIN (strlen (fake_name), sizeof (machine_name) - 1);
- strncpy (machine_name, fake_name, len);
- machine_name [len] = '\0';
- }
-
- switch (type) {
- case WAPI_SHM_DATA:
- name = g_strdup_printf ("shared_data-%s-%s-%s-%d-%d-%d",
- machine_name, ubuf.sysname,
- ubuf.machine,
- (int) sizeof(struct _WapiHandleShared),
- _WAPI_HANDLE_VERSION, 0);
- break;
-
- case WAPI_SHM_FILESHARE:
- name = g_strdup_printf ("shared_fileshare-%s-%s-%s-%d-%d-%d",
- machine_name, ubuf.sysname,
- ubuf.machine,
- (int) sizeof(struct _WapiFileShare),
- _WAPI_HANDLE_VERSION, 0);
- break;
- }
-
- return name;
-}
-
-#ifdef USE_SHM
-
-static gchar *_wapi_shm_shm_name (_wapi_shm_t type)
-{
- char *base_name = _wapi_shm_base_name (type);
-
- /* Also add the uid to avoid permission problems */
- char *res = g_strdup_printf ("/mono-shared-%d-%s", getuid (), base_name);
-
- g_free (base_name);
-
- return res;
-}
-
-static int
-_wapi_shm_open (const char *filename, int size)
-{
- int fd;
-
- fd = shm_open (filename, O_CREAT|O_RDWR, S_IRUSR|S_IWUSR|S_IRGRP);
- if (fd == -1)
- /* Maybe /dev/shm is not mounted */
- return -1;
- if (ftruncate (fd, size) != 0) {
- perror ("_wapi_shm_open (): ftruncate ()");
- g_assert_not_reached ();
- }
-
- return fd;
-}
-
-#endif
-
-static gchar *
-_wapi_shm_file (_wapi_shm_t type)
-{
- static gchar file[_POSIX_PATH_MAX];
- gchar *name = NULL, *filename;
- const gchar *wapi_dir;
-
- name = _wapi_shm_base_name (type);
-
- /* I don't know how nfs affects mmap. If mmap() of files on
- * nfs mounts breaks, then there should be an option to set
- * the directory.
- */
- wapi_dir = g_getenv ("MONO_SHARED_DIR");
- if (wapi_dir == NULL) {
- filename = g_build_filename (g_get_home_dir (), ".wapi", name,
- NULL);
- } else {
- filename = g_build_filename (wapi_dir, ".wapi", name, NULL);
- }
- g_free (name);
-
- g_snprintf (file, _POSIX_PATH_MAX, "%s", filename);
- g_free (filename);
-
- return file;
-}
-
-static int
-_wapi_shm_file_open (const gchar *filename, guint32 wanted_size)
-{
- int fd;
- struct stat statbuf;
- int ret, tries = 0;
- gboolean created = FALSE;
- mode_t oldmask;
- gchar *dir;
-
- /* No need to check if the dir already exists or check
- * mkdir() errors, because on any error the open() call will
- * report the problem.
- */
- dir = g_path_get_dirname (filename);
- mkdir (dir, 0755);
- g_free (dir);
-
-try_again:
- if (tries++ > 10) {
- /* Just give up */
- return (-1);
- } else if (tries > 5) {
- /* Break out of a loop */
- unlink (filename);
- }
-
- /* Make sure future processes can open the shared data files */
- oldmask = umask (066);
-
- /* No O_CREAT yet, because we need to initialise the file if
- * we have to create it.
- */
- fd = open (filename, O_RDWR, 0600);
- umask (oldmask);
-
- if (fd == -1 && errno == ENOENT) {
- /* OK, its up to us to create it. O_EXCL to avoid a
- * race condition where two processes can
- * simultaneously try and create the file
- */
- oldmask = umask (066);
- fd = open (filename, O_CREAT|O_EXCL|O_RDWR, 0600);
- umask (oldmask);
-
- if (fd == -1 && errno == EEXIST) {
- /* It's possible that the file was created in
- * between finding it didn't exist, and trying
- * to create it. Just try opening it again
- */
- goto try_again;
- } else if (fd == -1) {
- g_critical ("%s: shared file [%s] open error: %s",
- __func__, filename, g_strerror (errno));
- return -1;
- } else {
- /* We created the file, so we need to expand
- * the file.
- *
- * (wanted_size-1, because we're about to
- * write the other byte to actually expand the
- * file.)
- */
- if (lseek (fd, wanted_size-1, SEEK_SET) == -1) {
- g_critical ("%s: shared file [%s] lseek error: %s", __func__, filename, g_strerror (errno));
- close (fd);
- unlink (filename);
- return -1;
- }
-
- do {
- ret = write (fd, "", 1);
- } while (ret == -1 && errno == EINTR);
-
- if (ret == -1) {
- g_critical ("%s: shared file [%s] write error: %s", __func__, filename, g_strerror (errno));
- close (fd);
- unlink (filename);
- return -1;
- }
-
- created = TRUE;
-
- /* The contents of the file is set to all
- * zero, because it is opened up with lseek,
- * so we don't need to do any more
- * initialisation here
- */
- }
- } else if (fd == -1) {
- g_critical ("%s: shared file [%s] open error: %s", __func__,
- filename, g_strerror (errno));
- return -1;
- }
-
- /* Use stat to find the file size (instead of hard coding it)
- * because we can expand the file later if needed (for more
- * handles or scratch space.)
- */
- if (fstat (fd, &statbuf) == -1) {
- g_critical ("%s: fstat error: %s", __func__,
- g_strerror (errno));
- if (created == TRUE) {
- unlink (filename);
- }
- close (fd);
- return -1;
- }
-
- if (statbuf.st_size < wanted_size) {
- close (fd);
- if (created == TRUE) {
- g_critical ("%s: shared file [%s] is not big enough! (found %ld, need %d bytes)", __func__, filename, (long)statbuf.st_size, wanted_size);
- unlink (filename);
- return -1;
- } else {
- /* We didn't create it, so just try opening it again */
- _wapi_handle_spin (100);
- goto try_again;
- }
- }
-
- return fd;
-}
-
-gboolean
-_wapi_shm_enabled_internal (void)
-{
- static gboolean env_checked;
-
- if (!env_checked) {
- if (g_getenv ("MONO_ENABLE_SHM"))
- _wapi_shm_disabled = FALSE;
- env_checked = TRUE;
- }
-
- return !_wapi_shm_disabled;
-}
-
-/*
- * _wapi_shm_attach:
- * @success: Was it a success
- *
- * Attach to the shared memory file or create it if it did not exist.
- * Returns the memory area the file was mmapped to.
- */
-gpointer
-_wapi_shm_attach (_wapi_shm_t type)
-{
- gpointer shm_seg;
- int fd;
- struct stat statbuf;
- gchar *filename = _wapi_shm_file (type), *shm_name;
- guint32 size;
-
- switch(type) {
- case WAPI_SHM_DATA:
- size = sizeof(struct _WapiHandleSharedLayout);
- break;
-
- case WAPI_SHM_FILESHARE:
- size = sizeof(struct _WapiFileShareLayout);
- break;
- default:
- g_error ("Invalid type in _wapi_shm_attach ()");
- return NULL;
- }
-
- if (!_wapi_shm_enabled ()) {
- wapi_storage [type] = g_malloc0 (size);
- return wapi_storage [type];
- }
-
-#ifdef USE_SHM
- shm_name = _wapi_shm_shm_name (type);
- fd = _wapi_shm_open (shm_name, size);
- g_free (shm_name);
-#else
- fd = -1;
-#endif
-
- /* Fall back to files if POSIX shm fails (for example, because /dev/shm is not mounted */
- if (fd == -1)
- fd = _wapi_shm_file_open (filename, size);
- if (fd == -1) {
- g_critical ("%s: shared file [%s] open error", __func__,
- filename);
- return NULL;
- }
-
- if (fstat (fd, &statbuf)==-1) {
- g_critical ("%s: fstat error: %s", __func__,
- g_strerror (errno));
- close (fd);
- return NULL;
- }
-
- shm_seg = mmap (NULL, statbuf.st_size, PROT_READ|PROT_WRITE,
- MAP_SHARED, fd, 0);
- if (shm_seg == MAP_FAILED) {
- shm_seg = mmap (NULL, statbuf.st_size, PROT_READ|PROT_WRITE,
- MAP_PRIVATE, fd, 0);
- if (shm_seg == MAP_FAILED) {
- g_critical ("%s: mmap error: %s", __func__, g_strerror (errno));
- close (fd);
- return NULL;
- }
- }
-
- close (fd);
- return shm_seg;
-}
-
-void
-_wapi_shm_detach (_wapi_shm_t type)
-{
- if (!_wapi_shm_enabled ())
- g_free (wapi_storage [type]);
-}
-
-static void
-shm_semaphores_init (void)
-{
- key_t key;
- key_t oldkey;
- int thr_ret;
- struct _WapiHandleSharedLayout *tmp_shared;
- gchar *ftmp;
- gchar *filename;
-
- /*
- * Yet more barmy API - this union is a well-defined parameter
- * in a syscall, yet I still have to define it here as it
- * doesn't appear in a header
- */
- union semun {
- int val;
- struct semid_ds *buf;
- ushort *array;
- } defs;
- ushort def_vals[_WAPI_SHARED_SEM_COUNT];
- int i;
- int retries = 0;
-
- for (i = 0; i < _WAPI_SHARED_SEM_COUNT; i++) {
- def_vals[i] = 1;
- }
-
- /*
- * Process count must start at '0' - the 1 for all the others
- * sets the semaphore to "unlocked"
- */
- def_vals[_WAPI_SHARED_SEM_PROCESS_COUNT] = 0;
-
- defs.array = def_vals;
-
- /*
- *Temporarily attach the shared data so we can read the
- * semaphore key. We release this mapping and attach again
- * after getting the semaphores to avoid a race condition
- * where a terminating process can delete the shared files
- * between a new process attaching the file and getting access
- * to the semaphores (which increments the process count,
- * preventing destruction of the shared data...)
- */
- tmp_shared = _wapi_shm_attach (WAPI_SHM_DATA);
- g_assert (tmp_shared != NULL);
-
-#ifdef USE_SHM
- ftmp=_wapi_shm_shm_name (WAPI_SHM_DATA);
- filename = g_build_filename ("/dev/shm", ftmp, NULL);
- g_assert (filename!=NULL);
- key = ftok (filename, 'M');
- g_free (ftmp);
- g_free (filename);
-#else
- key = ftok ( _wapi_shm_file (WAPI_SHM_DATA), 'M');
-#endif
-
-again:
- retries++;
- oldkey = tmp_shared->sem_key;
-
- if (oldkey == 0) {
- DEBUGLOG ("%s: Creating with new key (0x%x)", __func__, key);
-
- /*
- * The while loop attempts to make some sense of the
- * bonkers 'think of a random number' method of
- * picking a key without collision with other
- * applications
- */
- while ((_wapi_sem_id = semget (key, _WAPI_SHARED_SEM_COUNT,
- IPC_CREAT | IPC_EXCL | 0600)) == -1) {
- if (errno == ENOMEM) {
- g_error ("%s: semget error: %s", __func__,
- g_strerror (errno));
- } else if (errno == ENOSPC) {
- g_error ("%s: semget error: %s. Try deleting some semaphores with ipcs and ipcrm\nor increase the maximum number of semaphore in the system.", __func__, g_strerror (errno));
- } else if (errno != EEXIST) {
- if (retries > 3)
- g_warning ("%s: semget error: %s key 0x%x - trying again", __func__,
- g_strerror (errno), key);
- }
-
- key++;
- DEBUGLOG ("%s: Got (%s), trying with new key (0x%x)", __func__, g_strerror (errno), key);
- }
- /*
- * Got a semaphore array, so initialise it and install
- * the key into the shared memory
- */
-
- if (semctl (_wapi_sem_id, 0, SETALL, defs) == -1) {
- if (retries > 3)
- g_warning ("%s: semctl init error: %s - trying again", __func__, g_strerror (errno));
-
- /*
- * Something went horribly wrong, so try
- * getting a new set from scratch
- */
- semctl (_wapi_sem_id, 0, IPC_RMID);
- goto again;
- }
-
- if (InterlockedCompareExchange (&tmp_shared->sem_key,
- key, 0) != 0) {
- /*
- * Someone else created one and installed the
- * key while we were working, so delete the
- * array we created and fall through to the
- * 'key already known' case.
- */
- semctl (_wapi_sem_id, 0, IPC_RMID);
- oldkey = tmp_shared->sem_key;
- } else {
- /*
- * We've installed this semaphore set's key into
- * the shared memory
- */
- goto done;
- }
- }
-
- DEBUGLOG ("%s: Trying with old key 0x%x", __func__, oldkey);
-
- _wapi_sem_id = semget (oldkey, _WAPI_SHARED_SEM_COUNT, 0600);
- if (_wapi_sem_id == -1) {
- if (retries > 3)
- g_warning ("%s: semget error opening old key 0x%x (%s) - trying again",
- __func__, oldkey,g_strerror (errno));
-
- /*
- * Someone must have deleted the semaphore set, so
- * blow away the bad key and try again
- */
- InterlockedCompareExchange (&tmp_shared->sem_key, 0, oldkey);
-
- goto again;
- }
-
- done:
- /* Increment the usage count of this semaphore set */
- thr_ret = _wapi_shm_sem_lock (_WAPI_SHARED_SEM_PROCESS_COUNT_LOCK);
- g_assert (thr_ret == 0);
-
- DEBUGLOG ("%s: Incrementing the process count (%d)", __func__, _wapi_getpid ());
-
- /*
- * We only ever _unlock_ this semaphore, letting the kernel
- * restore (ie decrement) this unlock when this process exits.
- * We lock another semaphore around it so we can serialise
- * access when we're testing the value of this semaphore when
- * we exit cleanly, so we can delete the whole semaphore set.
- */
- _wapi_shm_sem_unlock (_WAPI_SHARED_SEM_PROCESS_COUNT);
-
- DEBUGLOG ("%s: Process count is now %d (%d)", __func__, semctl (_wapi_sem_id, _WAPI_SHARED_SEM_PROCESS_COUNT, GETVAL), _wapi_getpid ());
-
- _wapi_shm_sem_unlock (_WAPI_SHARED_SEM_PROCESS_COUNT_LOCK);
-
- if (_wapi_shm_disabled)
- g_free (tmp_shared);
- else
- munmap (tmp_shared, sizeof(struct _WapiHandleSharedLayout));
-}
-
-static void
-shm_semaphores_remove (void)
-{
- int thr_ret;
- int proc_count;
- gchar *shm_name;
-
- DEBUGLOG ("%s: Checking process count (%d)", __func__, _wapi_getpid ());
-
- thr_ret = _wapi_shm_sem_lock (_WAPI_SHARED_SEM_PROCESS_COUNT_LOCK);
- g_assert (thr_ret == 0);
-
- proc_count = semctl (_wapi_sem_id, _WAPI_SHARED_SEM_PROCESS_COUNT,
- GETVAL);
-
- g_assert (proc_count > 0);
- if (proc_count == 1) {
- /*
- * Just us, so blow away the semaphores and the shared
- * files
- */
- DEBUGLOG ("%s: Removing semaphores! (%d)", __func__, _wapi_getpid ());
-
- semctl (_wapi_sem_id, 0, IPC_RMID);
-#ifdef USE_SHM
- shm_name = _wapi_shm_shm_name (WAPI_SHM_DATA);
- shm_unlink (shm_name);
- g_free (shm_name);
-
- shm_name = _wapi_shm_shm_name (WAPI_SHM_FILESHARE);
- shm_unlink (shm_name);
- g_free (shm_name);
-#endif
- unlink (_wapi_shm_file (WAPI_SHM_DATA));
- unlink (_wapi_shm_file (WAPI_SHM_FILESHARE));
- } else {
- /*
- * "else" clause, because there's no point unlocking
- * the semaphore if we've just blown it away...
- */
- _wapi_shm_sem_unlock (_WAPI_SHARED_SEM_PROCESS_COUNT_LOCK);
- }
-}
-
-static int
-shm_sem_lock (int sem)
-{
- struct sembuf ops;
- int ret;
-
- DEBUGLOG ("%s: locking sem %d", __func__, sem);
-
- ops.sem_num = sem;
- ops.sem_op = -1;
- ops.sem_flg = SEM_UNDO;
-
- retry:
- do {
- ret = semop (_wapi_sem_id, &ops, 1);
- } while (ret == -1 && errno == EINTR);
-
- if (ret == -1) {
- /*
- * EINVAL covers the case when the semaphore was
- * deleted before we started the semop
- */
- if (errno == EIDRM || errno == EINVAL) {
- /*
- * Someone blew away this semaphore set, so
- * get a new one and try again
- */
- DEBUGLOG ("%s: Reinitialising the semaphores!", __func__);
-
- _wapi_shm_semaphores_init ();
- goto retry;
- }
-
- /* Turn this into a pthreads-style return value */
- ret = errno;
- }
-
- DEBUGLOG ("%s: returning %d (%s)", __func__, ret, g_strerror (ret));
-
- return ret;
-}
-
-static int
-shm_sem_trylock (int sem)
-{
- struct sembuf ops;
- int ret;
-
- DEBUGLOG ("%s: trying to lock sem %d", __func__, sem);
-
- ops.sem_num = sem;
- ops.sem_op = -1;
- ops.sem_flg = IPC_NOWAIT | SEM_UNDO;
-
- retry:
- do {
- ret = semop (_wapi_sem_id, &ops, 1);
- } while (ret == -1 && errno == EINTR);
-
- if (ret == -1) {
- /*
- * EINVAL covers the case when the semaphore was
- * deleted before we started the semop
- */
- if (errno == EIDRM || errno == EINVAL) {
- /*
- * Someone blew away this semaphore set, so
- * get a new one and try again
- */
- DEBUGLOG ("%s: Reinitialising the semaphores!", __func__);
-
- _wapi_shm_semaphores_init ();
- goto retry;
- }
-
- /* Turn this into a pthreads-style return value */
- ret = errno;
- }
-
- if (ret == EAGAIN) {
- /* But pthreads uses this code instead */
- ret = EBUSY;
- }
-
- DEBUGLOG ("%s: returning %d (%s)", __func__, ret, g_strerror (ret));
-
- return ret;
-}
-
-static int
-shm_sem_unlock (int sem)
-{
- struct sembuf ops;
- int ret;
-
- DEBUGLOG ("%s: unlocking sem %d", __func__, sem);
-
- ops.sem_num = sem;
- ops.sem_op = 1;
- ops.sem_flg = SEM_UNDO;
-
- retry:
- do {
- ret = semop (_wapi_sem_id, &ops, 1);
- } while (ret == -1 && errno == EINTR);
-
- if (ret == -1) {
- /* EINVAL covers the case when the semaphore was
- * deleted before we started the semop
- */
- if (errno == EIDRM || errno == EINVAL) {
- /* Someone blew away this semaphore set, so
- * get a new one and try again (we can't just
- * assume that the semaphore is now unlocked)
- */
- DEBUGLOG ("%s: Reinitialising the semaphores!", __func__);
-
- _wapi_shm_semaphores_init ();
- goto retry;
- }
-
- /* Turn this into a pthreads-style return value */
- ret = errno;
- }
-
- DEBUGLOG ("%s: returning %d (%s)", __func__, ret, g_strerror (ret));
-
- return ret;
-}
-
-void
-_wapi_shm_semaphores_init (void)
-{
- if (!_wapi_shm_enabled ())
- noshm_semaphores_init ();
- else
- shm_semaphores_init ();
-}
-
-void
-_wapi_shm_semaphores_remove (void)
-{
- if (!_wapi_shm_disabled)
- shm_semaphores_remove ();
-}
-
-int
-_wapi_shm_sem_lock (int sem)
-{
- if (_wapi_shm_disabled)
- return noshm_sem_lock (sem);
- else
- return shm_sem_lock (sem);
+ DEBUGLOG ("%s: locking nosem %d", __func__, sem);
+ return mono_os_mutex_lock (&noshm_sems[sem]);
}
int
_wapi_shm_sem_trylock (int sem)
{
- if (_wapi_shm_disabled)
- return noshm_sem_trylock (sem);
- else
- return shm_sem_trylock (sem);
+ DEBUGLOG ("%s: trying to lock nosem %d", __func__, sem);
+ return mono_os_mutex_trylock (&noshm_sems[sem]);
}
int
_wapi_shm_sem_unlock (int sem)
{
- if (_wapi_shm_disabled)
- return noshm_sem_unlock (sem);
- else
- return shm_sem_unlock (sem);
+ DEBUGLOG ("%s: unlocking nosem %d", __func__, sem);
+ return mono_os_mutex_unlock (&noshm_sems[sem]);
}
-#endif /* !DISABLE_SHARED_HANDLES */
projects / mono.git / commitdiff