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root/radiance/ray/src/hd/rholo4.c
Revision: 3.15
Committed: Tue Dec 16 12:26:04 1997 UTC (26 years, 3 months ago) by gregl
Content type: text/plain
Branch: MAIN
Changes since 3.14: +1 -1 lines
Log Message:
took out unnecessary call to disp_check(1)

File Contents

# User Rev Content
1 gregl 3.1 /* Copyright (c) 1997 Silicon Graphics, Inc. */
2    
3     #ifndef lint
4     static char SCCSid[] = "$SunId$ SGI";
5     #endif
6    
7     /*
8     * Holodeck display process communication
9     */
10    
11     #include "rholo.h"
12     #include "rhdisp.h"
13 gregl 3.2 #include <sys/uio.h>
14 gregl 3.1
15 gregl 3.2 #ifndef HDSUF
16     #define HDSUF ".hdisp"
17     #endif
18 gregl 3.1
19 gregl 3.2 static int inp_flags;
20     static int dpd[3];
21 gregl 3.5 static FILE *dpout;
22 gregl 3.2
23    
24     disp_open(dname) /* open the named display driver */
25 gregl 3.1 char *dname;
26     {
27 gregl 3.11 char dpath[128], fd0[8], fd1[8], *cmd[5];
28 gregl 3.2 int i;
29 gregl 3.11 /* get full display program name */
30 gregl 3.2 #ifdef DEVPATH
31     sprintf(dpath, "%s/%s%s", DEVPATH, dname, HDSUF);
32     #else
33     sprintf(dpath, "dev/%s%s", dname, HDSUF);
34     #endif
35 gregl 3.11 /* dup stdin and stdout */
36     if (readinp)
37     sprintf(fd0, "%d", dup(0));
38     else
39     strcpy(fd0, "-1");
40     sprintf(fd1, "%d", dup(1));
41     /* start the display process */
42     cmd[0] = dpath;
43     cmd[1] = froot; cmd[2] = fd1; cmd[3] = fd0;
44     cmd[4] = NULL;
45     i = open_process(dpd, cmd);
46 gregl 3.6 if (i <= 0)
47 gregl 3.2 error(USER, "cannot start display process");
48 gregl 3.11 if ((dpout = fdopen(dpd[1], "w")) == NULL)
49 gregl 3.5 error(SYSTEM, "cannot associate FILE with display pipe");
50 gregl 3.11 dpd[1] = -1; /* causes ignored error in close_process() */
51 gregl 3.2 inp_flags = 0;
52 gregl 3.11 /* close dup'ed stdin and stdout */
53     if (readinp)
54     close(atoi(fd0));
55     close(atoi(fd1));
56 gregl 3.2 /* write out hologram grids */
57     for (i = 0; hdlist[i] != NULL; i++)
58     disp_result(DS_ADDHOLO, sizeof(HDGRID), (char *)hdlist[i]);
59 gregl 3.5 disp_flush();
60 gregl 3.1 }
61    
62    
63 gregl 3.2 disp_packet(p) /* display a packet */
64 gregl 3.4 register PACKHEAD *p;
65 gregl 3.2 {
66 gregl 3.4 disp_result(DS_BUNDLE, packsiz(p->nr), (char *)p);
67 gregl 3.2 }
68    
69    
70 gregl 3.1 disp_check(block) /* check display process */
71     int block;
72     {
73 gregl 3.2 MSGHEAD msg;
74     int n;
75     char *buf = NULL;
76    
77 gregl 3.6 if (dpout == NULL)
78 gregl 3.2 return(-1);
79 gregl 3.5 /* flush display output */
80     disp_flush();
81 gregl 3.3 /* check read blocking */
82 gregl 3.2 if (block != (inp_flags == 0)) {
83     inp_flags = block ? 0 : FNONBLK;
84     if (fcntl(dpd[0], F_SETFL, inp_flags) < 0)
85     goto fcntlerr;
86     }
87     /* read message header */
88     n = read(dpd[0], (char *)&msg, sizeof(MSGHEAD));
89     if (n != sizeof(MSGHEAD)) {
90 gregl 3.10 if (n >= 0) {
91     dpout = NULL;
92 gregl 3.2 error(USER, "display process died");
93 gregl 3.10 }
94 gregl 3.2 if (errno != EAGAIN & errno != EINTR)
95     goto readerr;
96 gregl 3.3 return(2); /* acceptable failure */
97 gregl 3.2 }
98     if (msg.nbytes) { /* get the message body */
99     buf = (char *)malloc(msg.nbytes);
100     if (buf == NULL)
101     error(SYSTEM, "out of memory in disp_check");
102     if (fcntl(dpd[0], F_SETFL, inp_flags=0) < 0)
103     goto fcntlerr;
104     if (readbuf(dpd[0], buf, msg.nbytes) != msg.nbytes)
105     goto readerr;
106     }
107     switch (msg.type) { /* take appropriate action */
108 gregl 3.12 case DR_BUNDLE: /* new bundle to calculate */
109 gregl 3.2 if (msg.nbytes != sizeof(PACKHEAD))
110     error(INTERNAL, "bad DR_BUNDLE from display process");
111     bundle_set(BS_ADD, (PACKHEAD *)buf, 1);
112     break;
113 gregl 3.12 case DR_NEWSET: /* new calculation set */
114 gregl 3.2 if (msg.nbytes % sizeof(PACKHEAD))
115     error(INTERNAL, "bad DR_NEWSET from display process");
116     disp_result(DS_STARTIMM, 0, NULL);
117     bundle_set(BS_NEW, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
118     disp_result(DS_ENDIMM, 0, NULL);
119 gregl 3.5 disp_flush();
120 gregl 3.2 break;
121 gregl 3.12 case DR_ADDSET: /* add to calculation set */
122 gregl 3.2 if (msg.nbytes % sizeof(PACKHEAD))
123     error(INTERNAL, "bad DR_ADDSET from display process");
124     disp_result(DS_STARTIMM, 0, NULL);
125     bundle_set(BS_ADD, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
126     disp_result(DS_ENDIMM, 0, NULL);
127 gregl 3.15 disp_flush();
128 gregl 3.2 break;
129 gregl 3.12 case DR_ADJSET: /* adjust calculation set members */
130 gregl 3.9 if (msg.nbytes % sizeof(PACKHEAD))
131     error(INTERNAL, "bad DR_ADJSET from display process");
132     disp_result(DS_STARTIMM, 0, NULL);
133     bundle_set(BS_ADJ, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
134     disp_result(DS_ENDIMM, 0, NULL);
135     disp_flush();
136     break;
137 gregl 3.12 case DR_DELSET: /* delete from calculation set */
138 gregl 3.2 if (msg.nbytes % sizeof(PACKHEAD))
139     error(INTERNAL, "bad DR_DELSET from display process");
140     bundle_set(BS_DEL, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
141     break;
142 gregl 3.12 case DR_ATTEN: /* block for priority request */
143 gregl 3.2 if (msg.nbytes)
144     error(INTERNAL, "bad DR_ATTEN from display process");
145     /* send acknowledgement */
146     disp_result(DS_ACKNOW, 0, NULL);
147 gregl 3.3 return(disp_check(1)); /* block on following request */
148 gregl 3.13 case DR_KILL: /* kill computation process(es) */
149     if (msg.nbytes)
150     error(INTERNAL, "bad DR_KILL from display process");
151 gregl 3.14 if (nprocs > 0)
152     done_rtrace();
153     else
154 gregl 3.13 error(WARNING, "no rtrace process to kill");
155     break;
156     case DR_RESTART: /* restart computation process(es) */
157     if (msg.nbytes)
158     error(INTERNAL, "bad DR_RESTART from display process");
159 gregl 3.14 if (ncprocs > nprocs)
160     new_rtrace();
161     else if (nprocs > 0)
162 gregl 3.13 error(WARNING, "rtrace already runnning");
163     else
164     error(WARNING, "holodeck not open for writing");
165     break;
166     case DR_CLOBBER: /* clobber holodeck */
167     if (msg.nbytes)
168     error(INTERNAL, "bad DR_CLOBBER from display process");
169     if (!force || !ncprocs)
170     error(WARNING, "request to clobber holodeck denied");
171     else {
172     error(WARNING, "clobbering holodeck contents");
173     hdclobber(NULL);
174     }
175     break;
176 gregl 3.12 case DR_SHUTDOWN: /* shut down program */
177 gregl 3.2 if (msg.nbytes)
178     error(INTERNAL, "bad DR_SHUTDOWN from display process");
179     return(0); /* zero return signals shutdown */
180 gregl 3.12 case DR_NOOP: /* do nothing */
181 gregl 3.7 break;
182 gregl 3.2 default:
183     error(INTERNAL, "unrecognized request from display process");
184     }
185 gregl 3.3 if (msg.nbytes) /* clean up */
186 gregl 3.2 free(buf);
187     return(1); /* normal return value */
188     fcntlerr:
189     error(SYSTEM, "cannot change display blocking mode");
190     readerr:
191     error(SYSTEM, "error reading from display process");
192 gregl 3.1 }
193    
194    
195 gregl 3.2 int
196     disp_close() /* close our display process */
197 gregl 3.1 {
198 gregl 3.2 int rval;
199    
200 gregl 3.6 if (dpout == NULL)
201 gregl 3.2 return(-1);
202     disp_result(DS_SHUTDOWN, 0, NULL);
203 gregl 3.5 fclose(dpout);
204     dpout = NULL;
205 gregl 3.2 return(close_process(dpd));
206     }
207    
208    
209 gregl 3.5 disp_result(type, nbytes, p) /* queue result message to display process */
210 gregl 3.2 int type, nbytes;
211     char *p;
212     {
213     MSGHEAD msg;
214    
215 gregl 3.6 if (dpout == NULL)
216     return;
217 gregl 3.2 msg.type = type;
218     msg.nbytes = nbytes;
219 gregl 3.5 fwrite((char *)&msg, sizeof(MSGHEAD), 1, dpout);
220     if (nbytes > 0)
221     fwrite(p, 1, nbytes, dpout);
222     }
223    
224    
225     disp_flush() /* flush output to display */
226     {
227     if (fflush(dpout) < 0)
228     error(SYSTEM, "error writing to the display process");
229 gregl 3.1 }