cgroup_enter_frozen

Name:Enter frozen/stopped state, if not yet there. Update cgroup's counters,* and revisit the state of the cgroup, if necessary.

Proto:void cgroup_enter_frozen(void)

Type:void

Parameter:Nothing

111

If frozen Then Return

114

spin_lock_irq( & css_set_lock)

115

frozen = true

116

cgrp = task_dfl_cgroup(current process)

117

Increment cgroup's nr_frozen_tasks.

118

Revisit the cgroup frozen state.* Checks if the cgroup is really frozen and perform all state transitions.

119

spin_unlock_irq( & css_set_lock)

**Caller**
Name	Describe
ptrace_stop	This must be called with current->sighand->siglock held.* This should be the path for all ptrace stops.* We always set current->last_siginfo while stopped here.* That makes it a way to test a stopped process for
do_signal_stop	do_signal_stop - handle group stop for SIGSTOP and other stop signals@signr: signr causing group stop if initiating If %JOBCTL_STOP_PENDING is not set yet, initiate group stop with @signr* and participate in it
do_freezer_trap	do_freezer_trap - handle the freezer jobctl trap* Puts the task into frozen state, if only the task is not about to quit.* In this case it drops JOBCTL_TRAP_FREEZE.* CONTEXT:* Must be called with @current->sighand->siglock held,

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