/* This function can be used during initialization to remove a previously held mutex that has not been released.
* This should only be used when there is no other process using the mutex */
void resetMutex() {
std::string mutex_name;
irods::error ret = getMutexName( mutex_name );
if ( !ret.ok() ) {
rodsLog( LOG_ERROR, "resetMutex: call to getMutexName failed" );
}
boost::interprocess::named_mutex::remove( mutex_name.c_str() );
}
int lockMutex( mutex_type **mutex ) {
std::string mutex_name;
irods::error ret = getMutexName( mutex_name );
if ( !ret.ok() ) {
rodsLog( LOG_ERROR, "lockMutex: call to getMutexName failed" );
return -1;
}
try {
*mutex = new boost::interprocess::named_mutex( boost::interprocess::open_or_create, mutex_name.c_str() );
}
catch ( const boost::interprocess::interprocess_exception& ) {
rodsLog( LOG_ERROR, "boost::interprocess::named_mutex threw a boost::interprocess::interprocess_exception." );
return -1;
}
try {
( *mutex )->lock();
}
catch ( const boost::interprocess::interprocess_exception& ) {
rodsLog( LOG_ERROR, "lock threw a boost::interprocess::interprocess_exception." );
return -1;
}
return 0;
}
/* create a new file mapping and open the shared buffer */
static int sharedBuffer_create (SharedBuffer* sb,char* bufferName){
int size = BUFFER_SIZE;
int res;
#ifndef WIN32
key_t kt;
int shmid, key_id;
struct shmid_ds shmds;
static int pid_ext = 0;
#endif
assert(sb != NULL);
assert(bufferName != NULL);
sb->data->name = bufferName;
sb->data->write_pointer = sb->data->read_pointer = 0;
sb->data->mutex = CreateMutex(NULL,FALSE,
(getMutexName(sb->data->name)));
if (sb->data->mutex == NULL){
error("SUBLIMEIO: Could not create mutex ");
exit(1);
}
#ifdef WIN32
sb->data->hMapFile =
CreateFileMapping(INVALID_HANDLE_VALUE, // use paging file
NULL, // default security
PAGE_READWRITE, // read/write access
0, // max. object size
size + (int)FIELDS_LENGTH(sb), // buffer size
bufferName); // name of mapping object
if ((sb->data->hMapFile == NULL)||
(sb->data->hMapFile == INVALID_HANDLE_VALUE)) {
error("SUBLIMEIO: Could not create file mapping object ");
exit(1);
}
#else /* !WIN32 */
if (getenv("SUBLIME_PROC_ID") == NULL){
key_id = getpid() + pid_ext++;
}
else {
key_id = atoi(getenv("SUBLIME_PROC_ID")) + pid_ext++;
}
kt = ftok(getTempDirLocation(),key_id);
/* malloc for file descriptor */
sb->data->hMapFile = (int *)malloc(sizeof(int));
if ( sb->data->hMapFile == NULL){
error("SUBLIMEIO: malloc failed");
}
/* 511 - all permissions */
if ((shmid = shmget(kt, BUFFER_SIZE, IPC_CREAT | 511 )) == -1){
error("CreateNewSharedBuffer: shmget failed");
}
//fprintf(stderr,"shared buffer number is %d and key is %d\n",shmid, key_id);
//fflush(stderr);
if ((shmctl(shmid, IPC_STAT, &shmds)) == -1){
error("CreateNewSharedBuffer: shmctl failed");
}
shmds.shm_perm.mode = shmds.shm_perm.mode | O_RDWR ;
*(sb->data->hMapFile) = shmid;
#endif /* WIN32 */
if ((res = sharedBuffer_open(sb, size)) != 0){
return res;
}
sb->data->dataBuffer->size = size;
return res;
}
