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(msg_host_t location, const char *name, 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->name = xbt_strdup(name);
28 res->processes = xbt_dynar_new(sizeof(msg_process_t),NULL);
30 xbt_swag_insert(res,msg_global->vms);
31 xbt_swag_insert(res, MSG_host_priv(location)->vms);
34 TRACE_msg_vm_create(name, location);
40 /** @brief Returns a newly constructed dynar containing all existing VMs in the system.
43 * Don't forget to free the dynar after use.
45 xbt_dynar_t MSG_vms_as_dynar(void) {
46 xbt_dynar_t res = xbt_dynar_new(sizeof(msg_vm_t),NULL);
48 xbt_swag_foreach(vm,msg_global->vms) {
49 xbt_dynar_push(res,&vm);
54 /** @brief Returns whether the given VM is currently suspended
57 int MSG_vm_is_suspended(msg_vm_t vm) {
58 return vm->state == msg_vm_state_suspended;
60 /** @brief Returns whether the given VM is currently running
63 int MSG_vm_is_running(msg_vm_t vm) {
64 return vm->state == msg_vm_state_running;
66 /** @brief Add the given process into the VM.
69 * Afterward, when the VM is migrated or suspended or whatever, the process will have the corresponding handling, too.
72 void MSG_vm_bind(msg_vm_t vm, msg_process_t process) {
73 /* check if the process is already in a VM */
74 simdata_process_t simdata = simcall_process_get_data(process);
76 msg_vm_t old_vm = simdata->vm;
77 int pos = xbt_dynar_search(old_vm->processes,&process);
78 xbt_dynar_remove_at(old_vm->processes,pos, NULL);
80 /* check if the host is in the right host */
81 if (simdata->m_host != vm->location) {
82 MSG_process_migrate(process,vm->location);
86 XBT_DEBUG("binding Process %s to %p",MSG_process_get_name(process),vm);
88 xbt_dynar_push_as(vm->processes,msg_process_t,process);
90 /** @brief Removes the given process from the given VM, and kill it
93 * Will raise a not_found exception if the process were not bound to that VM
95 void MSG_vm_unbind(msg_vm_t vm, msg_process_t process) {
96 int pos = xbt_dynar_search(vm->processes,process);
97 xbt_dynar_remove_at(vm->processes,pos, NULL);
98 MSG_process_kill(process);
101 /** @brief Immediately change the host on which all processes are running.
104 * No migration cost occurs. If you want to simulate this too, you want to use a
105 * MSG_task_send() before or after, depending on whether you want to do cold or hot
108 void MSG_vm_migrate(msg_vm_t vm, msg_host_t destination) {
110 msg_process_t process;
111 xbt_dynar_foreach(vm->processes,cpt,process) {
112 MSG_process_migrate(process,destination);
114 xbt_swag_remove(vm, MSG_host_priv(vm->location)->vms);
115 xbt_swag_insert_at_tail(vm, MSG_host_priv(destination)->vms);
118 TRACE_msg_vm_change_host(vm,vm->location,destination);
121 vm->location = destination;
124 /** @brief Immediately suspend the execution of all processes within the given VM.
127 * No suspension cost occurs. If you want to simulate this too, you want to
128 * use a \ref MSG_file_write() before or after, depending on the exact semantic
129 * of VM suspend to you.
131 void MSG_vm_suspend(msg_vm_t vm) {
133 msg_process_t process;
134 xbt_dynar_foreach(vm->processes,cpt,process) {
135 XBT_DEBUG("suspend process %s of host %s",MSG_process_get_name(process),MSG_host_get_name(MSG_process_get_host(process)));
136 MSG_process_suspend(process);
140 TRACE_msg_vm_suspend(vm);
144 /** @brief Immediately resumes the execution of all processes within the given VM.
147 * No resume cost occurs. If you want to simulate this too, you want to
148 * use a \ref MSG_file_read() before or after, depending on the exact semantic
149 * of VM resume to you.
151 void MSG_vm_resume(msg_vm_t vm) {
153 msg_process_t process;
154 xbt_dynar_foreach(vm->processes,cpt,process) {
155 XBT_DEBUG("resume process %s of host %s",MSG_process_get_name(process),MSG_host_get_name(MSG_process_get_host(process)));
156 MSG_process_resume(process);
160 TRACE_msg_vm_resume(vm);
164 /** @brief Immediately kills all processes within the given VM. Any memory that they allocated will be leaked.
167 * No extra delay occurs. If you want to simulate this too, you want to
168 * use a #MSG_process_sleep() or something. I'm not quite sure.
170 void MSG_vm_shutdown(msg_vm_t vm)
172 msg_process_t process;
173 XBT_DEBUG("%lu processes in the VM", xbt_dynar_length(vm->processes));
174 while (!xbt_dynar_is_empty(vm->processes)) {
175 process = xbt_dynar_get_as(vm->processes,0,msg_process_t);
176 MSG_process_kill(process);
180 TRACE_msg_vm_kill(vm);
187 * \brief Reboot the VM, restarting all the processes in it.
189 void MSG_vm_reboot(msg_vm_t vm)
191 xbt_dynar_t process_list = xbt_dynar_new(sizeof(msg_process_t), NULL);
192 msg_process_t process;
195 xbt_dynar_foreach(vm->processes, cpt, process) {
196 xbt_dynar_push_as(process_list, msg_process_t, process);
199 xbt_dynar_foreach(process_list, cpt, process) {
200 msg_process_t new_process = MSG_process_restart(process);
201 MSG_vm_bind(vm, new_process);
204 xbt_dynar_free(&process_list);
207 /** @brief Destroy a msg_vm_t.
210 void MSG_vm_destroy(msg_vm_t vm) {
212 msg_process_t process;
213 xbt_dynar_foreach(vm->processes,cpt,process) {
215 simdata_process_t simdata = simcall_process_get_data(process);
220 TRACE_msg_vm_end(vm);
224 xbt_dynar_free(&vm->processes);