citadel/threads.h

   1 /* $Id:$ */
   2
   3 #ifndef THREADS_H
   4 #define THREADS_H
   5
   6 #include "sysdep.h"
   7
   8 #ifdef HAVE_PTHREAD_H
   9 #include <pthread.h>
  10 #endif
  11
  12 #include <sys/time.h>
  13 #include <string.h>
  14
  15 #ifdef HAVE_DB_H
  16 #include <db.h>
  17 #elif defined(HAVE_DB4_DB_H)
  18 #include <db4/db.h>
  19 #else
  20 #error Neither <db.h> nor <db4/db.h> was found by configure. Install db4-devel.
  21 #endif
  22
  23 #include "server.h"
  24 #include "sysdep_decls.h"
  25
  26 #ifndef timerclear
  27 #define timerclear(tvp)         ((tvp)->tv_sec = (tvp)->tv_usec = 0)
  28 #endif
  29
  30 #ifndef timerisset
  31 #define timerisset(tvp)         ((tvp)->tv_sec || (tvp)->tv_usec)
  32 #endif
  33
  34 #ifndef timercmp
  35 #define timercmp(tvp, uvp, cmp) \
  36  (((tvp)->tv_sec == (uvp)->tv_sec) ? \
  37      ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
  38      ((tvp)->tv_sec cmp (uvp)->tv_sec))
  39 #endif
  40
  41 #ifndef timeradd
  42 #define timeradd(tvp, uvp, vvp) \
  43  do { \
  44   (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec; \
  45   (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
  46   if ((vvp)->tv_usec >= 1000000) { \
  47    (vvp)->tv_sec++; \
  48    (vvp)->tv_usec -= 1000000; \
  49   } \
  50  } while (0)
  51 #endif
  52
  53 #ifndef timersub
  54 #define timersub(tvp, uvp, vvp) \
  55  do { \
  56   (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
  57   (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
  58   if ((vvp)->tv_usec < 0) { \
  59    (vvp)->tv_sec--; \
  60    (vvp)->tv_usec += 1000000; \
  61   } \
  62  } while (0)
  63 #endif
  64
  65
  66 // #define THREADS_USESIGNALS
  67
  68 /*
  69  * Thread stuff
  70  */
  71
  72 enum CtdlThreadState {
  73         CTDL_THREAD_INVALID,
  74         CTDL_THREAD_VALID,
  75         CTDL_THREAD_CREATE,
  76         CTDL_THREAD_CANCELLED,
  77         CTDL_THREAD_EXITED,
  78         CTDL_THREAD_STOPPING,
  79         CTDL_THREAD_STOP_REQ,   /* Do NOT put any running states before this state */
  80         CTDL_THREAD_SLEEPING,
  81         CTDL_THREAD_BLOCKED,
  82         CTDL_THREAD_RUNNING,
  83         CTDL_THREAD_LAST_STATE
  84 };
  85 typedef struct CtdlThreadNode CtdlThreadNode;
  86
  87 struct CtdlThreadNode{
  88         citthread_t tid;                                /* id as returned by citthread_create() */
  89         pid_t pid;                              /* pid, as best the OS will let us determine */
  90         time_t when;                            /* When to start a scheduled thread */
  91         struct CitContext *Context;             /* The session context that this thread mught be working on or NULL if none */
  92         long number;                            /* A unigue number for this thread (not implimented yet) */
  93         int wakefd_recv;                        /* An fd that this thread can sleep on (not implimented yet) */
  94         int wakefd_send;                        /* An fd that this thread can send out on (Not implimented yet) */
  95         int signal;                             /* A field to store a signal we caught. */
  96         const char *name;                       /* A name for this thread */
  97         void *(*thread_func) (void *arg);       /* The actual function that does this threads work */
  98         void *user_args;                        /* Arguments passed to this threads work function */
  99         long flags;                             /* Flags that describe this thread */
 100         enum CtdlThreadState state;             /* Flag to show state of this thread */
 101         time_t stop_ticker;                     /* A counter to determine how long it has taken for this thread to exit */
 102         citthread_mutex_t ThreadMutex;          /* A mutex to sync this thread to others if this thread allows (also used for sleeping) */
 103         citthread_cond_t ThreadCond;            /* A condition variable to sync this thread with others */
 104         citthread_mutex_t SleepMutex;           /* A mutex for sleeping */
 105         citthread_cond_t SleepCond;             /* A condition variable for sleeping */
 106         citthread_attr_t attr;                  /* Attributes of this thread */
 107         struct timeval start_time;              /* Time this thread was started */
 108         struct timeval last_state_change;       /* Time when this thread last changed state */
 109         double avg_sleeping;                    /* Average sleeping time */
 110         double avg_running;                     /* Average running time */
 111         double avg_blocked;                     /* Average blocked time */
 112         double load_avg;                        /* Load average for this thread */
 113         CtdlThreadNode *prev;           /* Previous thread in the thread table */
 114         CtdlThreadNode *next;           /* Next thread in the thread table */
 115 } ;
 116
 117 extern CtdlThreadNode *CtdlThreadList;
 118
 119 typedef struct ThreadTSD ThreadTSD;
 120
 121 struct ThreadTSD {
 122         DB_TXN *tid;            /* Transaction handle */
 123         DBC *cursors[MAXCDB];   /* Cursors, for traversals... */
 124         CtdlThreadNode *self;   /* Pointer to this threads control structure */
 125 } ;
 126
 127 extern double CtdlThreadLoadAvg;
 128 extern double CtdlThreadWorkerAvg;
 129 extern citthread_key_t ThreadKey;
 130
 131 void ctdl_thread_internal_init_tsd(void);
 132 void ctdl_internal_thread_gc (void);
 133 void ctdl_thread_internal_init(void);
 134 void ctdl_thread_internal_cleanup(void);
 135 void ctdl_thread_internal_calc_loadavg(void);
 136 void ctdl_thread_internal_free_tsd(void);
 137 CtdlThreadNode *ctdl_internal_create_thread(char *name, long flags, void *(*thread_func) (void *arg), void *args);
 138 void ctdl_thread_internal_check_scheduled(void);
 139
 140 void InitialiseSemaphores(void);
 141 int try_critical_section (int which_one);
 142 void begin_critical_section (int which_one);
 143 void end_critical_section (int which_one);
 144 void go_threading(void);
 145
 146 #endif // THREADS_H