Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

include/linux/sem.h

@@ -0,0 +1,157 @@
+#ifndef _LINUX_SEM_H
+#define _LINUX_SEM_H
+
+#include <linux/ipc.h>
+#include <asm/atomic.h>
+
+/* semop flags */
+#define SEM_UNDO        0x1000  /* undo the operation on exit */
+
+/* semctl Command Definitions. */
+#define GETPID  11       /* get sempid */
+#define GETVAL  12       /* get semval */
+#define GETALL  13       /* get all semval's */
+#define GETNCNT 14       /* get semncnt */
+#define GETZCNT 15       /* get semzcnt */
+#define SETVAL  16       /* set semval */
+#define SETALL  17       /* set all semval's */
+
+/* ipcs ctl cmds */
+#define SEM_STAT 18
+#define SEM_INFO 19
+
+/* Obsolete, used only for backwards compatibility and libc5 compiles */
+struct semid_ds {
+	struct ipc_perm	sem_perm;		/* permissions .. see ipc.h */
+	__kernel_time_t	sem_otime;		/* last semop time */
+	__kernel_time_t	sem_ctime;		/* last change time */
+	struct sem	*sem_base;		/* ptr to first semaphore in array */
+	struct sem_queue *sem_pending;		/* pending operations to be processed */
+	struct sem_queue **sem_pending_last;	/* last pending operation */
+	struct sem_undo	*undo;			/* undo requests on this array */
+	unsigned short	sem_nsems;		/* no. of semaphores in array */
+};
+
+/* Include the definition of semid64_ds */
+#include <asm/sembuf.h>
+
+/* semop system calls takes an array of these. */
+struct sembuf {
+	unsigned short  sem_num;	/* semaphore index in array */
+	short		sem_op;		/* semaphore operation */
+	short		sem_flg;	/* operation flags */
+};
+
+/* arg for semctl system calls. */
+union semun {
+	int val;			/* value for SETVAL */
+	struct semid_ds __user *buf;	/* buffer for IPC_STAT & IPC_SET */
+	unsigned short __user *array;	/* array for GETALL & SETALL */
+	struct seminfo __user *__buf;	/* buffer for IPC_INFO */
+	void __user *__pad;
+};
+
+struct  seminfo {
+	int semmap;
+	int semmni;
+	int semmns;
+	int semmnu;
+	int semmsl;
+	int semopm;
+	int semume;
+	int semusz;
+	int semvmx;
+	int semaem;
+};
+
+#define SEMMNI  128             /* <= IPCMNI  max # of semaphore identifiers */
+#define SEMMSL  250             /* <= 8 000 max num of semaphores per id */
+#define SEMMNS  (SEMMNI*SEMMSL) /* <= INT_MAX max # of semaphores in system */
+#define SEMOPM  32	        /* <= 1 000 max num of ops per semop call */
+#define SEMVMX  32767           /* <= 32767 semaphore maximum value */
+#define SEMAEM  SEMVMX          /* adjust on exit max value */
+
+/* unused */
+#define SEMUME  SEMOPM          /* max num of undo entries per process */
+#define SEMMNU  SEMMNS          /* num of undo structures system wide */
+#define SEMMAP  SEMMNS          /* # of entries in semaphore map */
+#define SEMUSZ  20		/* sizeof struct sem_undo */
+
+#ifdef __KERNEL__
+
+/* One semaphore structure for each semaphore in the system. */
+struct sem {
+	int	semval;		/* current value */
+	int	sempid;		/* pid of last operation */
+};
+
+/* One sem_array data structure for each set of semaphores in the system. */
+struct sem_array {
+	struct kern_ipc_perm	sem_perm;	/* permissions .. see ipc.h */
+	time_t			sem_otime;	/* last semop time */
+	time_t			sem_ctime;	/* last change time */
+	struct sem		*sem_base;	/* ptr to first semaphore in array */
+	struct sem_queue	*sem_pending;	/* pending operations to be processed */
+	struct sem_queue	**sem_pending_last; /* last pending operation */
+	struct sem_undo		*undo;		/* undo requests on this array */
+	unsigned long		sem_nsems;	/* no. of semaphores in array */
+};
+
+/* One queue for each sleeping process in the system. */
+struct sem_queue {
+	struct sem_queue *	next;	 /* next entry in the queue */
+	struct sem_queue **	prev;	 /* previous entry in the queue, *(q->prev) == q */
+	struct task_struct*	sleeper; /* this process */
+	struct sem_undo *	undo;	 /* undo structure */
+	int    			pid;	 /* process id of requesting process */
+	int    			status;	 /* completion status of operation */
+	struct sem_array *	sma;	 /* semaphore array for operations */
+	int			id;	 /* internal sem id */
+	struct sembuf *		sops;	 /* array of pending operations */
+	int			nsops;	 /* number of operations */
+	int			alter;   /* does the operation alter the array? */
+};
+
+/* Each task has a list of undo requests. They are executed automatically
+ * when the process exits.
+ */
+struct sem_undo {
+	struct sem_undo *	proc_next;	/* next entry on this process */
+	struct sem_undo *	id_next;	/* next entry on this semaphore set */
+	int			semid;		/* semaphore set identifier */
+	short *			semadj;		/* array of adjustments, one per semaphore */
+};
+
+/* sem_undo_list controls shared access to the list of sem_undo structures
+ * that may be shared among all a CLONE_SYSVSEM task group.
+ */ 
+struct sem_undo_list {
+	atomic_t	refcnt;
+	spinlock_t	lock;
+	struct sem_undo	*proc_list;
+};
+
+struct sysv_sem {
+	struct sem_undo_list *undo_list;
+};
+
+#ifdef CONFIG_SYSVIPC
+
+extern int copy_semundo(unsigned long clone_flags, struct task_struct *tsk);
+extern void exit_sem(struct task_struct *tsk);
+
+#else
+static inline int copy_semundo(unsigned long clone_flags, struct task_struct *tsk)
+{
+	return 0;
+}
+
+static inline void exit_sem(struct task_struct *tsk)
+{
+	return;
+}
+#endif
+
+#endif /* __KERNEL__ */
+
+#endif /* _LINUX_SEM_H */