bool f_shm_detach(int64 shm_identifier) {
Lock lock(g_shm_mutex);
set<sysvshm_shm*>::iterator iter = g_shms.find((sysvshm_shm*)shm_identifier);
if (iter == g_shms.end()) {
raise_warning("%lld is not a SysV shared memory index", shm_identifier);
return false;
}
g_shms.erase(iter);
delete *iter;
return true;
}
bool f_shm_has_var(int64 shm_identifier, int64 variable_key) {
Lock lock(g_shm_mutex);
std::set<sysvshm_shm*>::iterator iter =
g_shms.find((sysvshm_shm*)shm_identifier);
if (iter == g_shms.end()) {
raise_warning("%" PRId64 " is not a SysV shared memory index",
shm_identifier);
return false;
}
sysvshm_shm *shm_list_ptr = *iter;
long shm_varpos = check_shm_data(shm_list_ptr->ptr, variable_key);
return shm_varpos >= 0;
}
bool f_shm_remove(int64 shm_identifier) {
Lock lock(g_shm_mutex);
set<sysvshm_shm*>::iterator iter = g_shms.find((sysvshm_shm*)shm_identifier);
if (iter == g_shms.end()) {
raise_warning("%lld is not a SysV shared memory index", shm_identifier);
return false;
}
sysvshm_shm *shm_list_ptr = *iter;
if (shmctl(shm_list_ptr->id, IPC_RMID,NULL) < 0) {
raise_warning("failed for key 0x%x, id %lld: %s", shm_list_ptr->key,
shm_identifier, Util::safe_strerror(errno).c_str());
return false;
}
return true;
}
bool f_shm_remove_var(int64 shm_identifier, int64 variable_key) {
Lock lock(g_shm_mutex);
set<sysvshm_shm*>::iterator iter = g_shms.find((sysvshm_shm*)shm_identifier);
if (iter == g_shms.end()) {
raise_warning("%lld is not a SysV shared memory index", shm_identifier);
return false;
}
sysvshm_shm *shm_list_ptr = *iter;
long shm_varpos = check_shm_data(shm_list_ptr->ptr, variable_key);
if (shm_varpos < 0) {
raise_warning("variable key %lld doesn't exist", variable_key);
return false;
}
remove_shm_data(shm_list_ptr->ptr, shm_varpos);
return true;
}
Variant f_shm_get_var(int64 shm_identifier, int64 variable_key) {
Lock lock(g_shm_mutex);
set<sysvshm_shm*>::iterator iter = g_shms.find((sysvshm_shm*)shm_identifier);
if (iter == g_shms.end()) {
raise_warning("%lld is not a SysV shared memory index", shm_identifier);
return false;
}
sysvshm_shm *shm_list_ptr = *iter;
long shm_varpos = check_shm_data(shm_list_ptr->ptr, variable_key);
if (shm_varpos < 0) {
return false;
}
sysvshm_chunk *shm_var =
(sysvshm_chunk*)((char *)shm_list_ptr->ptr + shm_varpos);
return f_unserialize(String(&shm_var->mem, shm_var->length, AttachLiteral));
}
bool f_shm_put_var(int64 shm_identifier, int64 variable_key,
CVarRef variable) {
Lock lock(g_shm_mutex);
set<sysvshm_shm*>::iterator iter = g_shms.find((sysvshm_shm*)shm_identifier);
if (iter == g_shms.end()) {
raise_warning("%lld is not a SysV shared memory index", shm_identifier);
return false;
}
sysvshm_shm *shm_list_ptr = *iter;
/* setup string-variable and serialize */
String serialized = f_serialize(variable);
/* insert serialized variable into shared memory */
int ret = put_shm_data(shm_list_ptr->ptr, variable_key,
(char*)serialized.data(), serialized.size());
if (ret == -1) {
raise_warning("not enough shared memory left");
return false;
}
return true;
}