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forking: Introduce last_pid_mutex and helpers

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Introduce mutex for synchronization ns_last_pid file
on restore.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
This commit is contained in:
Kirill Tkhai 2017-05-16 19:26:59 +03:00 committed by Andrei Vagin
parent a90aad23a4
commit e032b85c51
2 changed files with 14 additions and 0 deletions
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1
criu/cr-restore.c
View File

@ -2403,6 +2403,7 @@ int prepare_task_entries(void)
task_entries->nr_helpers = 0; task_entries->nr_helpers = 0;
futex_set(&task_entries->start, CR_STATE_FAIL); futex_set(&task_entries->start, CR_STATE_FAIL);
mutex_init(&task_entries->userns_sync_lock); mutex_init(&task_entries->userns_sync_lock);
mutex_init(&task_entries->last_pid_mutex);
return 0; return 0;
} }

13
criu/include/rst_info.h
View File

@ -11,6 +11,7 @@ struct task_entries {
futex_t start; futex_t start;
atomic_t cr_err; atomic_t cr_err;
mutex_t userns_sync_lock; mutex_t userns_sync_lock;
mutex_t last_pid_mutex;
}; };
struct fdt { struct fdt {
@ -66,4 +67,16 @@ struct rst_info {
void *breakpoint; void *breakpoint;
}; };
extern struct task_entries *task_entries;
static inline void lock_last_pid(void)
{
mutex_lock(&task_entries->last_pid_mutex);
}
static inline void unlock_last_pid(void)
{
mutex_unlock(&task_entries->last_pid_mutex);
}
#endif /* __CR_RST_INFO_H__ */ #endif /* __CR_RST_INFO_H__ */