1 /* Copyright (c) 2012. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "msg_private.h"
7 #include "xbt/sysdep.h"
10 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_vm, msg,
11 "Cloud-oriented parts of the MSG API");
13 /** @brief Create a new (empty) VMs
16 * @bug it is expected that in the future, the coreAmount parameter will be used
17 * to add extra constraints on the execution, but the argument is ignored for now.
20 msg_vm_t MSG_vm_start(m_host_t location, int coreAmount) {
21 msg_vm_t res = xbt_new0(s_msg_vm_t,1);
22 res->all_vms_hookup.prev = NULL;
23 res->host_vms_hookup.prev = NULL;
24 res->state = msg_vm_state_running;
25 res->location = location;
26 res->coreAmount = coreAmount;
27 res->processes = xbt_dynar_new(sizeof(m_process_t),NULL);
29 xbt_swag_insert(res,msg_global->vms);
30 xbt_swag_insert(res,location->vms);
34 /** @brief Returns a newly constructed dynar containing all existing VMs in the system
37 * Don't forget to free the dynar after use.
39 xbt_dynar_t MSG_vms_as_dynar(void) {
40 xbt_dynar_t res = xbt_dynar_new(sizeof(msg_vm_t),NULL);
42 xbt_swag_foreach(vm,msg_global->vms) {
43 xbt_dynar_push(res,&vm);
48 /** @brief Returns whether the given VM is currently suspended
51 int MSG_vm_is_suspended(msg_vm_t vm) {
52 return vm->state == msg_vm_state_suspended;
54 /** @brief Returns whether the given VM is currently running
57 int MSG_vm_is_running(msg_vm_t vm) {
58 return vm->state == msg_vm_state_running;
60 /** @brief Add the given process into the VM.
63 * Afterward, when the VM is migrated or suspended or whatever, the process will have the corresponding handling, too.
65 * @bug for now, if a binded process terminates, every VM functions will segfault. Baaaad.
67 void MSG_vm_bind(msg_vm_t vm, m_process_t process) {
68 xbt_dynar_push_as(vm->processes,m_process_t,process);
70 /** @brief Removes the given process from the given VM, and kill it
73 * Will raise a not_found exception if the process were not binded to that VM
75 void MSG_vm_unbind(msg_vm_t vm, m_process_t process) {
76 int pos = xbt_dynar_search(vm->processes,process);
77 xbt_dynar_remove_at(vm->processes,pos, NULL);
78 MSG_process_kill(process);
81 /** @brief Immediately change the host on which all processes are running
84 * No migration cost occurs. If you want to simulate this too, you want to use a
85 * MSG_task_send() before or after, depending on whether you want to do cold or hot
88 void MSG_vm_migrate(msg_vm_t vm, m_host_t destination) {
91 xbt_dynar_foreach(vm->processes,cpt,process) {
92 MSG_process_migrate(process,destination);
94 xbt_swag_remove(vm,vm->location->vms);
95 xbt_swag_insert_at_tail(vm,destination->vms);
96 vm->location = destination;
99 /** @brief Immediately suspend the execution of all processes within the given VM
102 * No suspension cost occurs. If you want to simulate this too, you want to
103 * use a \ref MSG_file_write() before or after, depending on the exact semantic
104 * of VM suspend to you.
106 void MSG_vm_suspend(msg_vm_t vm) {
109 xbt_dynar_foreach(vm->processes,cpt,process) {
110 XBT_INFO("suspend process %s of host %s",MSG_process_get_name(process),MSG_host_get_name(MSG_process_get_host(process)));
111 MSG_process_suspend(process);
115 /** @brief Immediately resumes the execution of all processes within the given VM
118 * No resume cost occurs. If you want to simulate this too, you want to
119 * use a \ref MSG_file_read() before or after, depending on the exact semantic
120 * of VM resume to you.
122 void MSG_vm_resume(msg_vm_t vm) {
125 xbt_dynar_foreach(vm->processes,cpt,process) {
126 XBT_INFO("resume process %s of host %s",MSG_process_get_name(process),MSG_host_get_name(MSG_process_get_host(process)));
127 MSG_process_resume(process);
131 /** @brief Immediately kills all processes within the given VM. Any memory that they allocated will be leaked.
134 * No extra delay occurs. If you want to simulate this too, you want to
135 * use a #MSG_process_sleep() or something. I'm not quite sure.
137 void MSG_vm_shutdown(msg_vm_t vm) {
140 xbt_dynar_foreach(vm->processes,cpt,process) {
141 MSG_process_kill(process);