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#ifndef lint |
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static const char RCSid[] = "$Id: raypcalls.c,v 2.38 2024/04/30 22:25:46 greg Exp $"; |
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#endif |
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/* |
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* raypcalls.c - interface for parallel rendering using Radiance |
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* |
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* External symbols declared in ray.h |
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*/ |
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|
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#include "copyright.h" |
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|
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/* |
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* These calls are designed similarly to the ones in raycalls.c, |
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* but allow for multiple rendering processes on the same host |
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* machine. There is no sense in specifying more child processes |
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* than you have processor cores, but one child may help by allowing |
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* asynchronous ray computation in an interactive program, and |
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* will protect the caller from fatal rendering errors. |
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* |
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* You should first read and understand the header in raycalls.c, |
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* as some things are explained there that are not repated here. |
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* |
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* The first step is opening one or more rendering processes |
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* with a call to ray_pinit(oct, nproc). Before calling fork(), |
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* ray_pinit() loads the octree and data structures into the |
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* caller's memory, and ray_popen() synchronizes the ambient |
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* file, if any. Shared memory permits all sorts of queries |
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* that wouldn't be possible otherwise without causing any real |
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* memory overhead, since all the static data are shared |
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* between processes. Rays are traced using a simple |
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* queuing mechanism, explained below. |
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* |
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* The ray queue buffers RAYQLEN rays before sending to |
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* children, each of which may internally buffer RAYQLEN rays |
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* during evaluation. Rays are not returned in the order |
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* they are sent when multiple processes are open. |
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* |
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* Rays are queued and returned by a single |
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* ray_pqueue() call. A ray_pqueue() return |
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* value of 0 indicates that no rays are ready |
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* and the queue is not yet full. A return value of 1 |
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* indicates that a ray was returned, though it is probably |
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* not the one you just requested. Rays may be identified by |
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* the rno member of the RAY struct, which is incremented |
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* by the rayorigin() call, or may be set explicitly by |
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* the caller. Below is an example call sequence: |
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* |
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* myRay.rorg = ( ray origin point ) |
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* myRay.rdir = ( normalized ray direction ) |
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* myRay.rmax = ( maximum length, or zero for no limit ) |
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* rayorigin(&myRay, PRIMARY, NULL, NULL); |
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* myRay.rno = ( my personal ray identifier ) |
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* if (ray_pqueue(&myRay) == 1) |
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* { do something with results } |
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* |
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* Note the differences between this and the simpler ray_trace() |
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* call. In particular, the call may or may not return a value |
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* in the passed ray structure. Also, you need to call rayorigin() |
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* yourself, which is normally called for you by ray_trace(). The |
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* benefit is that ray_pqueue() will trace rays faster in |
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* proportion to the number of CPUs you have available on your |
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* system. If the ray queue is full before the call, ray_pqueue() |
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* will block until a result is ready so it can queue this one. |
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* The global int ray_pnidle indicates the number of currently idle |
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* children. If you want to check for completed rays without blocking, |
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* or get the results from rays that have been queued without |
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* queuing any new ones, the ray_presult() call is for you: |
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* |
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* if (ray_presult(&myRay, 1) == 1) |
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* { do something with results } |
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* |
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* If the second argument is 1, the call won't block when |
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* results aren't ready, but will immediately return 0. |
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* If the second argument is 0, the call will block |
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* until a value is available, returning 0 only if the |
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* queue is completely empty. Setting the second argument |
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* to -1 returns 0 unless a ray is ready in the queue and |
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* no system calls are needed. A negative return value |
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* indicates that a rendering process died. If this |
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* happens, ray_pclose(0) is automatically called to close |
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* all child processes, and ray_pnprocs is set to zero. |
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* |
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* If you just want to fill the ray queue without checking for |
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* results, check ray_pnidle and call ray_psend(): |
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* |
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* while (ray_pnidle) { |
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* ( set up ray ) |
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* ray_psend(&myRay); |
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* } |
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* |
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* Note that it is a mistake to call ra_psend() when |
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* ray_pnidle is zero, and nothing will be sent in |
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* this case. Otherwise, the ray_presult() and/or ray_pqueue() |
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* functions may be called subsequently to read back the results |
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* of rays queued by ray_psend(). |
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* |
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* When you are done, you may call ray_pdone(1) to close |
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* all child processes and clean up memory used by Radiance. |
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* Any queued ray calculations will be awaited and discarded. |
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* As with ray_done(), ray_pdone(0) hangs onto data files |
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* and fonts that are likely to be used in subsequent renderings. |
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* Whether you need to clean up memory or not, you should |
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* at least call ray_pclose(0) to await the child processes. |
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* The caller should define a quit() function that calls |
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* ray_pclose(0) if ray_pnprocs > 0. |
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* |
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* Warning: You cannot affect any of the rendering processes |
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* by changing global parameter values onece ray_pinit() has |
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* been called. Changing global parameters will have no effect |
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* until the next call to ray_pinit(), which restarts everything. |
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* If you just want to reap children so that you can alter the |
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* rendering parameters without reloading the scene, use the |
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* ray_pclose(0) and ray_popen(nproc) calls to close |
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* then restart the child processes after the changes are made. |
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* |
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* Note: These routines are written to coordinate with the |
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* definitions in raycalls.c, and in fact depend on them. |
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* If you want to trace a ray and get a result synchronously, |
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* use the ray_trace() call to compute it in the parent process. |
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* This will not interfere with any subprocess calculations, |
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* but beware that a fatal error may end with a call to quit(). |
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* |
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* Note: One of the advantages of using separate processes |
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* is that it gives the calling program some immunity from |
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* fatal rendering errors. As discussed in raycalls.c, |
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* Radiance tends to throw up its hands and exit at the |
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* first sign of trouble, calling quit() to return control |
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* to the top level. Although you can avoid exit() with |
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* your own longjmp() in quit(), the cleanup afterwards |
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* is always suspect. Through the use of subprocesses, |
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* we avoid this pitfall by closing the processes and |
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* returning a negative value from ray_pqueue() or |
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* ray_presult(). If you get a negative value from either |
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* of these calls, you can assume that the processes have |
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* been cleaned up with a call to ray_pclose(), though you |
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* will have to call ray_pdone() yourself if you want to |
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* free memory. Obviously, you cannot continue rendering |
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* without risking further errors, but otherwise your |
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* process should not be compromised. |
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*/ |
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|
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#include "rtprocess.h" |
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#include "ray.h" |
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#include "ambient.h" |
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#include <sys/types.h> |
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#include <sys/wait.h> |
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#include "selcall.h" |
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|
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#ifndef RAYQLEN |
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#define RAYQLEN 24 /* # rays to send at once */ |
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#endif |
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|
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#ifndef MAX_RPROCS |
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#if (FD_SETSIZE/2-4 < 64) |
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#define MAX_NPROCS (FD_SETSIZE/2-4) |
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#else |
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#define MAX_NPROCS 64 /* max. # rendering processes */ |
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#endif |
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#endif |
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|
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extern char *shm_boundary; /* boundary of shared memory */ |
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|
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int ray_pnprocs = 0; /* number of child processes */ |
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int ray_pnidle = 0; /* number of idle children */ |
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|
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static struct child_proc { |
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RT_PID pid; /* child process id */ |
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int fd_send; /* write to child here */ |
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int fd_recv; /* read from child here */ |
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int npending; /* # rays in process */ |
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RNUMBER rno[RAYQLEN]; /* working on these rays */ |
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} r_proc[MAX_NPROCS]; /* our child processes */ |
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|
| 174 |
static RAY r_queue[2*RAYQLEN]; /* ray i/o buffer */ |
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static int r_send_next = 0; /* next send ray placement */ |
| 176 |
static int r_recv_first = RAYQLEN; /* position of first unreported ray */ |
| 177 |
static int r_recv_next = RAYQLEN; /* next received ray placement */ |
| 178 |
|
| 179 |
static int samplestep = 1; /* sample step size */ |
| 180 |
|
| 181 |
#define sendq_full() (r_send_next >= RAYQLEN) |
| 182 |
|
| 183 |
static int ray_pflush(void); |
| 184 |
static void ray_pchild(int fd_in, int fd_out); |
| 185 |
|
| 186 |
|
| 187 |
void |
| 188 |
ray_pinit( /* initialize ray-tracing processes */ |
| 189 |
char *otnm, |
| 190 |
int nproc |
| 191 |
) |
| 192 |
{ |
| 193 |
if (nobjects > 0) /* close old calculation */ |
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ray_pdone(0); |
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|
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ray_init(otnm); /* load the shared scene */ |
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|
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ray_popen(nproc); /* fork children */ |
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} |
| 200 |
|
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|
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static int |
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ray_pflush(void) /* send queued rays to idle children */ |
| 204 |
{ |
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int nc, n, nw, i, sfirst; |
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|
| 207 |
if ((ray_pnidle <= 0) | (r_send_next <= 0)) |
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return(0); /* nothing we can send */ |
| 209 |
|
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sfirst = 0; /* divvy up labor */ |
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nc = ray_pnidle; |
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for (i = ray_pnprocs; nc && i--; ) { |
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if (r_proc[i].npending > 0) |
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continue; /* child looks busy */ |
| 215 |
n = (r_send_next - sfirst) / nc--; |
| 216 |
if (!n) |
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continue; |
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/* smuggle set size in crtype */ |
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r_queue[sfirst].crtype = n; |
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nw = writebuf(r_proc[i].fd_send, &r_queue[sfirst], |
| 221 |
sizeof(RAY)*n); |
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if (nw != sizeof(RAY)*n) |
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return(-1); /* write error */ |
| 224 |
r_proc[i].npending = n; |
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while (n--) /* record ray IDs */ |
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r_proc[i].rno[n] = r_queue[sfirst+n].rno; |
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sfirst += r_proc[i].npending; |
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ray_pnidle--; /* now she's busy */ |
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} |
| 230 |
if (sfirst != r_send_next) |
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error(CONSISTENCY, "code screwup in ray_pflush()"); |
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r_send_next = 0; |
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return(sfirst); /* return total # sent */ |
| 234 |
} |
| 235 |
|
| 236 |
|
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int |
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ray_psend( /* add a ray to our send queue */ |
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RAY *r |
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) |
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{ |
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int rv; |
| 243 |
|
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if ((r == NULL) | (ray_pnidle <= 0)) |
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return(0); |
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/* flush output if necessary */ |
| 247 |
if (sendq_full() && (rv = ray_pflush()) <= 0) |
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return(rv); |
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|
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r_queue[r_send_next++] = *r; |
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return(1); |
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} |
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|
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|
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int |
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ray_pqueue( /* queue a ray for computation */ |
| 257 |
RAY *r |
| 258 |
) |
| 259 |
{ |
| 260 |
if (r == NULL) |
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return(0); |
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/* check for full send queue */ |
| 263 |
if (sendq_full()) { |
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RAY mySend = *r; |
| 265 |
/* wait for a result */ |
| 266 |
if (ray_presult(r, 0) <= 0) |
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return(-1); |
| 268 |
/* put new ray in queue */ |
| 269 |
r_queue[r_send_next++] = mySend; |
| 270 |
|
| 271 |
return(1); |
| 272 |
} |
| 273 |
/* else add ray to send queue */ |
| 274 |
r_queue[r_send_next++] = *r; |
| 275 |
/* check for returned ray... */ |
| 276 |
if (r_recv_first >= r_recv_next) |
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return(0); |
| 278 |
/* ...one is sitting in queue */ |
| 279 |
*r = r_queue[r_recv_first++]; |
| 280 |
return(1); |
| 281 |
} |
| 282 |
|
| 283 |
|
| 284 |
int |
| 285 |
ray_presult( /* check for a completed ray */ |
| 286 |
RAY *r, |
| 287 |
int poll |
| 288 |
) |
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{ |
| 290 |
static struct timeval tpoll; /* zero timeval struct */ |
| 291 |
static fd_set readset, errset; |
| 292 |
int n, ok; |
| 293 |
int pn; |
| 294 |
|
| 295 |
if (r == NULL) |
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return(0); |
| 297 |
/* check queued results first */ |
| 298 |
if (r_recv_first < r_recv_next) { |
| 299 |
*r = r_queue[r_recv_first++]; |
| 300 |
return(1); |
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} |
| 302 |
if (poll < 0) /* immediate polling mode? */ |
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return(0); |
| 304 |
|
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n = ray_pnprocs - ray_pnidle; /* pending before flush? */ |
| 306 |
|
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if (ray_pflush() < 0) /* send new rays to process */ |
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return(-1); |
| 309 |
/* reset receive queue */ |
| 310 |
r_recv_first = r_recv_next = RAYQLEN; |
| 311 |
|
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if (!poll) /* count newly sent unless polling */ |
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n = ray_pnprocs - ray_pnidle; |
| 314 |
if (n <= 0) /* return if nothing to await */ |
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return(0); |
| 316 |
if (!poll && ray_pnprocs == 1) /* one process -> skip select() */ |
| 317 |
FD_SET(r_proc[0].fd_recv, &readset); |
| 318 |
|
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getready: /* any children waiting for us? */ |
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for (pn = ray_pnprocs; pn--; ) |
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if (FD_ISSET(r_proc[pn].fd_recv, &readset) || |
| 322 |
FD_ISSET(r_proc[pn].fd_recv, &errset)) |
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break; |
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/* call select() if we must */ |
| 325 |
if (pn < 0) { |
| 326 |
FD_ZERO(&readset); FD_ZERO(&errset); n = 0; |
| 327 |
for (pn = ray_pnprocs; pn--; ) { |
| 328 |
if (r_proc[pn].npending > 0) |
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FD_SET(r_proc[pn].fd_recv, &readset); |
| 330 |
FD_SET(r_proc[pn].fd_recv, &errset); |
| 331 |
if (r_proc[pn].fd_recv >= n) |
| 332 |
n = r_proc[pn].fd_recv + 1; |
| 333 |
} |
| 334 |
/* find out who is ready */ |
| 335 |
while ((n = select(n, &readset, (fd_set *)NULL, &errset, |
| 336 |
poll ? &tpoll : (struct timeval *)NULL)) < 0) |
| 337 |
if (errno != EINTR) { |
| 338 |
error(WARNING, |
| 339 |
"select call failed in ray_presult()"); |
| 340 |
ray_pclose(0); |
| 341 |
return(-1); |
| 342 |
} |
| 343 |
if (n > 0) /* go back and get it */ |
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goto getready; |
| 345 |
return(0); /* else poll came up empty */ |
| 346 |
} |
| 347 |
if (r_recv_next + r_proc[pn].npending > sizeof(r_queue)/sizeof(RAY)) |
| 348 |
error(CONSISTENCY, "buffer shortage in ray_presult()"); |
| 349 |
|
| 350 |
/* read rendered ray data */ |
| 351 |
n = readbuf(r_proc[pn].fd_recv, &r_queue[r_recv_next], |
| 352 |
sizeof(RAY)*r_proc[pn].npending); |
| 353 |
if (n > 0) { |
| 354 |
r_recv_next += n/sizeof(RAY); |
| 355 |
ok = (n == sizeof(RAY)*r_proc[pn].npending); |
| 356 |
} else |
| 357 |
ok = 0; |
| 358 |
/* reset child's status */ |
| 359 |
FD_CLR(r_proc[pn].fd_recv, &readset); |
| 360 |
if (n <= 0) |
| 361 |
FD_CLR(r_proc[pn].fd_recv, &errset); |
| 362 |
r_proc[pn].npending = 0; |
| 363 |
ray_pnidle++; |
| 364 |
/* check for rendering errors */ |
| 365 |
if (!ok) { |
| 366 |
ray_pclose(0); /* process died -- clean up */ |
| 367 |
return(-1); |
| 368 |
} |
| 369 |
/* preen returned rays */ |
| 370 |
for (n = r_recv_next - r_recv_first; n--; ) { |
| 371 |
RAY *rp = &r_queue[r_recv_first + n]; |
| 372 |
rp->rno = r_proc[pn].rno[n]; |
| 373 |
rp->parent = NULL; |
| 374 |
rp->newcset = rp->clipset = NULL; |
| 375 |
rp->rox = NULL; |
| 376 |
rp->slights = NULL; |
| 377 |
} |
| 378 |
/* return first ray received */ |
| 379 |
*r = r_queue[r_recv_first++]; |
| 380 |
return(1); |
| 381 |
} |
| 382 |
|
| 383 |
|
| 384 |
void |
| 385 |
ray_pdone( /* reap children and free data */ |
| 386 |
int freall |
| 387 |
) |
| 388 |
{ |
| 389 |
ray_pclose(0); /* close child processes */ |
| 390 |
|
| 391 |
if (shm_boundary != NULL) { /* clear shared memory boundary */ |
| 392 |
free((void *)shm_boundary); |
| 393 |
shm_boundary = NULL; |
| 394 |
} |
| 395 |
|
| 396 |
ray_done(freall); /* free rendering data */ |
| 397 |
} |
| 398 |
|
| 399 |
|
| 400 |
static void |
| 401 |
ray_pchild( /* process rays (never returns) */ |
| 402 |
int fd_in, |
| 403 |
int fd_out |
| 404 |
) |
| 405 |
{ |
| 406 |
int n; |
| 407 |
int i; |
| 408 |
/* flag child process for quit() */ |
| 409 |
ray_pnprocs = -1; |
| 410 |
/* read each ray request set */ |
| 411 |
while ((n = read(fd_in, (char *)r_queue, sizeof(r_queue))) > 0) { |
| 412 |
int n2; |
| 413 |
if (n < sizeof(RAY)) |
| 414 |
break; |
| 415 |
/* get smuggled set length */ |
| 416 |
n2 = sizeof(RAY)*r_queue[0].crtype - n; |
| 417 |
if (n2 < 0) |
| 418 |
error(INTERNAL, "buffer over-read in ray_pchild()"); |
| 419 |
if (n2 > 0) { /* read the rest of the set */ |
| 420 |
i = readbuf(fd_in, (char *)r_queue + n, n2); |
| 421 |
if (i != n2) |
| 422 |
break; |
| 423 |
n += n2; |
| 424 |
} |
| 425 |
n /= sizeof(RAY); |
| 426 |
/* evaluate rays */ |
| 427 |
for (i = 0; i < n; i++) { |
| 428 |
r_queue[i].crtype = r_queue[i].rtype; |
| 429 |
r_queue[i].parent = NULL; |
| 430 |
r_queue[i].clipset = NULL; |
| 431 |
r_queue[i].slights = NULL; |
| 432 |
r_queue[i].rlvl = 0; |
| 433 |
samplendx += samplestep; |
| 434 |
rayclear(&r_queue[i]); |
| 435 |
rayvalue(&r_queue[i]); |
| 436 |
} |
| 437 |
/* write back our results */ |
| 438 |
i = writebuf(fd_out, r_queue, sizeof(RAY)*n); |
| 439 |
if (i != sizeof(RAY)*n) |
| 440 |
error(SYSTEM, "write error in ray_pchild()"); |
| 441 |
} |
| 442 |
if (n) |
| 443 |
error(SYSTEM, "read error in ray_pchild()"); |
| 444 |
ambsync(); |
| 445 |
quit(0); /* normal exit */ |
| 446 |
} |
| 447 |
|
| 448 |
|
| 449 |
void |
| 450 |
ray_popen( /* open the specified # processes */ |
| 451 |
int nadd |
| 452 |
) |
| 453 |
{ |
| 454 |
/* check if our table has room */ |
| 455 |
if (ray_pnprocs + nadd > MAX_NPROCS) |
| 456 |
nadd = MAX_NPROCS - ray_pnprocs; |
| 457 |
if (nadd <= 0) |
| 458 |
return; |
| 459 |
if (nobjects <= 0) |
| 460 |
error(CONSISTENCY, "ray_popen() called before scene loaded"); |
| 461 |
ambsync(); /* load any new ambient values */ |
| 462 |
if (shm_boundary == NULL) { /* first child process? */ |
| 463 |
preload_objs(); /* preload auxiliary data */ |
| 464 |
/* set shared memory boundary */ |
| 465 |
shm_boundary = (char *)malloc(16); |
| 466 |
strcpy(shm_boundary, "SHM_BOUNDARY"); |
| 467 |
} |
| 468 |
fflush(NULL); /* clear pending output */ |
| 469 |
samplestep = ray_pnprocs + nadd; |
| 470 |
while (nadd--) { /* fork each new process */ |
| 471 |
int p0[2], p1[2]; |
| 472 |
if (pipe(p0) < 0 || pipe(p1) < 0) |
| 473 |
error(SYSTEM, "cannot create pipe"); |
| 474 |
if ((r_proc[ray_pnprocs].pid = fork()) == 0) { |
| 475 |
int pn; /* close others' descriptors */ |
| 476 |
for (pn = ray_pnprocs; pn--; ) { |
| 477 |
close(r_proc[pn].fd_send); |
| 478 |
close(r_proc[pn].fd_recv); |
| 479 |
} |
| 480 |
close(p0[0]); close(p1[1]); |
| 481 |
close(0); /* don't share stdin */ |
| 482 |
/* following call never returns */ |
| 483 |
ray_pchild(p1[0], p0[1]); |
| 484 |
} |
| 485 |
if (r_proc[ray_pnprocs].pid < 0) |
| 486 |
error(SYSTEM, "cannot fork child process"); |
| 487 |
close(p1[0]); close(p0[1]); |
| 488 |
if (rand_samp) /* decorrelate random sequence */ |
| 489 |
srandom(random()); |
| 490 |
else |
| 491 |
samplendx++; |
| 492 |
/* |
| 493 |
* Close write stream on exec to avoid multiprocessing deadlock. |
| 494 |
* No use in read stream without it, so set flag there as well. |
| 495 |
*/ |
| 496 |
fcntl(p1[1], F_SETFD, FD_CLOEXEC); |
| 497 |
fcntl(p0[0], F_SETFD, FD_CLOEXEC); |
| 498 |
r_proc[ray_pnprocs].fd_send = p1[1]; |
| 499 |
r_proc[ray_pnprocs].fd_recv = p0[0]; |
| 500 |
r_proc[ray_pnprocs].npending = 0; |
| 501 |
ray_pnprocs++; |
| 502 |
ray_pnidle++; |
| 503 |
} |
| 504 |
} |
| 505 |
|
| 506 |
|
| 507 |
void |
| 508 |
ray_pclose( /* close one or more child processes */ |
| 509 |
int nsub |
| 510 |
) |
| 511 |
{ |
| 512 |
static int inclose = 0; |
| 513 |
RAY res; |
| 514 |
int i, status = 0; |
| 515 |
/* check no child / in child */ |
| 516 |
if (ray_pnprocs <= 0) |
| 517 |
return; |
| 518 |
/* check recursion */ |
| 519 |
if (inclose) |
| 520 |
return; |
| 521 |
inclose++; |
| 522 |
/* check argument */ |
| 523 |
if ((nsub <= 0) | (nsub > ray_pnprocs)) |
| 524 |
nsub = ray_pnprocs; |
| 525 |
/* clear our ray queue */ |
| 526 |
i = r_send_next; |
| 527 |
r_send_next = 0; |
| 528 |
while (ray_presult(&res,0) > 0) |
| 529 |
++i; |
| 530 |
if (i) { |
| 531 |
sprintf(errmsg, "dropped %d rays in ray_pclose()", i); |
| 532 |
error(WARNING, errmsg); |
| 533 |
} |
| 534 |
r_recv_first = r_recv_next = RAYQLEN; |
| 535 |
/* close send pipes */ |
| 536 |
for (i = ray_pnprocs-nsub; i < ray_pnprocs; i++) |
| 537 |
close(r_proc[i].fd_send); |
| 538 |
|
| 539 |
if (nsub == 1) { /* awaiting single process? */ |
| 540 |
if (waitpid(r_proc[ray_pnprocs-1].pid, &status, 0) < 0) |
| 541 |
status = 127<<8; |
| 542 |
close(r_proc[ray_pnprocs-1].fd_recv); |
| 543 |
} else /* else unordered wait */ |
| 544 |
for (i = 0; i < nsub; ) { |
| 545 |
int j, mystatus; |
| 546 |
RT_PID pid = wait(&mystatus); |
| 547 |
if (pid < 0) { |
| 548 |
status = 127<<8; |
| 549 |
break; |
| 550 |
} |
| 551 |
for (j = ray_pnprocs-nsub; j < ray_pnprocs; j++) |
| 552 |
if (r_proc[j].pid == pid) { |
| 553 |
if (mystatus) |
| 554 |
status = mystatus; |
| 555 |
close(r_proc[j].fd_recv); |
| 556 |
++i; |
| 557 |
} |
| 558 |
} |
| 559 |
ray_pnprocs -= nsub; |
| 560 |
ray_pnidle -= nsub; |
| 561 |
if (status) { |
| 562 |
sprintf(errmsg, "rendering process exited with code %d", status>>8); |
| 563 |
error(WARNING, errmsg); |
| 564 |
} |
| 565 |
inclose--; |
| 566 |
} |
