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SIGCHLD and wait4(), i.e. wait()/waitpid() implementation

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Balazs Gerofi bgerofi@riken.jp
2014-04-23 13:33:18 +09:00
parent 7103fed1dc
commit 0e348e6295
6 changed files with 315 additions and 14 deletions
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53
kernel/include/process.h
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@ -52,6 +52,32 @@
#define PS_NORMAL (PS_INTERRUPTIBLE | PS_UNINTERRUPTIBLE)
/* Waitpid options */
#define WNOHANG 0x00000001
#define WUNTRACED 0x00000002
#define WSTOPPED WUNTRACED
#define WEXITED 0x00000004
#define WCONTINUED 0x00000008
#define WNOWAIT 0x01000000 /* Don't reap, just poll status. */
/* If WIFEXITED(STATUS), the low-order 8 bits of the status. */
#define __WEXITSTATUS(status) (((status) & 0xff00) >> 8)
/* If WIFSIGNALED(STATUS), the terminating signal. */
#define __WTERMSIG(status) ((status) & 0x7f)
/* If WIFSTOPPED(STATUS), the signal that stopped the child. */
#define __WSTOPSIG(status) __WEXITSTATUS(status)
/* Nonzero if STATUS indicates normal termination. */
#define __WIFEXITED(status) (__WTERMSIG(status) == 0)
/* Nonzero if STATUS indicates termination by a signal. */
#define __WIFSIGNALED(status) \
(((signed char) (((status) & 0x7f) + 1) >> 1) > 0)
/* Nonzero if STATUS indicates the child is stopped. */
#define __WIFSTOPPED(status) (((status) & 0xff) == 0x7f)
#ifdef ATTACHED_MIC
//#define USE_LARGE_PAGES
#endif
@ -88,7 +114,7 @@ struct sig_handler {
struct sig_pending {
struct list_head list;
sigset_t sigmask;
// TODO: siginfo
siginfo_t info;
};
struct sig_shared {
@ -99,6 +125,29 @@ struct sig_shared {
typedef void pgio_func_t(void *arg);
/* Represents a node in the process fork tree, it may exist even after the
* corresponding process exited due to references from the parent and/or
* children and is used for implementing wait/waitpid without having a
* special "init" process */
struct fork_tree_node {
ihk_spinlock_t lock;
ihk_atomic_t refcount;
int exit_status;
int status;
struct process *owner;
int pid;
struct fork_tree_node *parent;
struct list_head children;
struct list_head siblings_list;
struct waitq waitpid_q;
};
void hold_fork_tree_node(struct fork_tree_node *ftn);
void release_fork_tree_node(struct fork_tree_node *ftn);
struct process {
int pid;
int status;
@ -136,6 +185,8 @@ struct process {
struct rlimit rlimit_stack;
pgio_func_t *pgio_fp;
void *pgio_arg;
struct fork_tree_node *ftn;
};
struct process_vm {