Time::HiRes ualarm for VMS without one

Message-Id: <011027232650.19ae30@DUPHY4.Physics.Drexel.Edu>

p4raw-id: //depot/perl@12722

diff --git a/ext/Time/HiRes/HiRes.xs b/ext/Time/HiRes/HiRes.xs
index 08fe5cc..952544e 100644 (file)
--- a/ext/Time/HiRes/HiRes.xs
+++ b/ext/Time/HiRes/HiRes.xs
@@ -324,6 +324,205 @@ hrt_ualarm(int usec, int interval)
 }
 #endif
 
+#if !defined(HAS_UALARM) && defined(VMS)
+#define HAS_UALARM
+#define ualarm vms_ualarm 
+
+#include <lib$routines.h>
+#include <ssdef.h>
+#include <starlet.h>
+#include <descrip.h>
+#include <signal.h>
+#include <jpidef.h>
+#include <psldef.h>
+
+#define VMSERR(s)   (!((s)&1))
+
+static void
+us_to_VMS(useconds_t mseconds, unsigned long v[])
+{
+    int iss;
+    unsigned long qq[2];
+
+    qq[0] = mseconds;
+    qq[1] = 0;
+    v[0] = v[1] = 0;
+
+    iss = lib$addx(qq,qq,qq);
+    if (VMSERR(iss)) lib$signal(iss);
+    iss = lib$subx(v,qq,v);
+    if (VMSERR(iss)) lib$signal(iss);
+    iss = lib$addx(qq,qq,qq);
+    if (VMSERR(iss)) lib$signal(iss);
+    iss = lib$subx(v,qq,v);
+    if (VMSERR(iss)) lib$signal(iss);
+    iss = lib$subx(v,qq,v);
+    if (VMSERR(iss)) lib$signal(iss);
+}
+
+static int
+VMS_to_us(unsigned long v[])
+{
+    int iss;
+    unsigned long div=10,quot, rem;
+
+    iss = lib$ediv(&div,v,&quot,&rem);
+    if (VMSERR(iss)) lib$signal(iss);
+
+    return quot;
+}
+
+typedef unsigned short word;
+typedef struct _ualarm {
+    int function;
+    int repeat;
+    unsigned long delay[2];
+    unsigned long interval[2];
+    unsigned long remain[2];
+} Alarm;
+
+
+static int alarm_ef;
+static Alarm *a0, alarm_base;
+#define UAL_NULL   0
+#define UAL_SET    1
+#define UAL_CLEAR  2
+#define UAL_ACTIVE 4
+static void ualarm_AST(Alarm *a);
+
+static int 
+vms_ualarm(int mseconds, int interval)
+{
+    Alarm *a, abase;
+    struct item_list3 {
+        word length;
+        word code;
+        void *bufaddr;
+        void *retlenaddr;
+    } ;
+    static struct item_list3 itmlst[2];
+    static int first = 1;
+    unsigned long asten;
+    int iss, enabled;
+
+    if (first) {
+        first = 0;
+        itmlst[0].code       = JPI$_ASTEN;
+        itmlst[0].length     = sizeof(asten);
+        itmlst[0].retlenaddr = NULL;
+        itmlst[1].code       = 0;
+        itmlst[1].length     = 0;
+        itmlst[1].bufaddr    = NULL;
+        itmlst[1].retlenaddr = NULL;
+
+        iss = lib$get_ef(&alarm_ef);
+        if (VMSERR(iss)) lib$signal(iss);
+
+        a0 = &alarm_base;
+        a0->function = UAL_NULL;
+    }
+    itmlst[0].bufaddr    = &asten;
+    
+    iss = sys$getjpiw(0,0,0,itmlst,0,0,0);
+    if (VMSERR(iss)) lib$signal(iss);
+    if (!(asten&0x08)) return -1;
+
+    a = &abase;
+    if (mseconds) {
+        a->function = UAL_SET;
+    } else {
+        a->function = UAL_CLEAR;
+    }
+
+    us_to_VMS(mseconds, a->delay);
+    if (interval) {
+        us_to_VMS(interval, a->interval);
+        a->repeat = 1;
+    } else 
+        a->repeat = 0;
+
+    iss = sys$clref(alarm_ef);
+    if (VMSERR(iss)) lib$signal(iss);
+
+    iss = sys$dclast(ualarm_AST,a,0);
+    if (VMSERR(iss)) lib$signal(iss);
+
+    iss = sys$waitfr(alarm_ef);
+    if (VMSERR(iss)) lib$signal(iss);
+
+    if (a->function == UAL_ACTIVE) 
+        return VMS_to_us(a->remain);
+    else
+        return 0;
+}
+
+
+
+static void
+ualarm_AST(Alarm *a)
+{
+    int iss;
+    unsigned long now[2];
+
+    iss = sys$gettim(now);
+    if (VMSERR(iss)) lib$signal(iss);
+
+    if (a->function == UAL_SET || a->function == UAL_CLEAR) {
+        if (a0->function == UAL_ACTIVE) {
+            iss = sys$cantim(a0,PSL$C_USER);
+            if (VMSERR(iss)) lib$signal(iss);
+
+            iss = lib$subx(a0->remain, now, a->remain);
+            if (VMSERR(iss)) lib$signal(iss);
+
+            if (a->remain[1] & 0x80000000) 
+                a->remain[0] = a->remain[1] = 0;
+        }
+
+        if (a->function == UAL_SET) {
+            a->function = a0->function;
+            a0->function = UAL_ACTIVE;
+            a0->repeat = a->repeat;
+            if (a0->repeat) {
+                a0->interval[0] = a->interval[0];
+                a0->interval[1] = a->interval[1];
+            }
+            a0->delay[0] = a->delay[0];
+            a0->delay[1] = a->delay[1];
+
+            iss = lib$subx(now, a0->delay, a0->remain);
+            if (VMSERR(iss)) lib$signal(iss);
+
+            iss = sys$setimr(0,a0->delay,ualarm_AST,a0);
+            if (VMSERR(iss)) lib$signal(iss);
+        } else {
+            a->function = a0->function;
+            a0->function = UAL_NULL;
+        }
+        iss = sys$setef(alarm_ef);
+        if (VMSERR(iss)) lib$signal(iss);
+    } else if (a->function == UAL_ACTIVE) {
+        if (a->repeat) {
+            iss = lib$subx(now, a->interval, a->remain);
+            if (VMSERR(iss)) lib$signal(iss);
+
+            iss = sys$setimr(0,a->interval,ualarm_AST,a);
+            if (VMSERR(iss)) lib$signal(iss);
+        } else {
+            a->function = UAL_NULL;
+        }
+        iss = sys$wake(0,0);
+        if (VMSERR(iss)) lib$signal(iss);
+        lib$signal(SS$_ASTFLT);
+    } else {
+        lib$signal(SS$_BADPARAM);
+    }
+}
+
+#endif /* !HAS_UALARM && VMS */
+
+
+
 #ifdef HAS_GETTIMEOFDAY
 
 static int