1 /* -----------------------------------------------------------------------------
3 * (c) The GHC Team 1998-2000
5 * Main function for a standalone Haskell program.
7 * ---------------------------------------------------------------------------*/
9 #define COMPILING_RTS_MAIN
11 #include "PosixSource.h"
23 # include "Printer.h" /* for printing */
27 # include "Parallel.h"
28 # include "ParallelRts.h"
32 #if defined(GRAN) || defined(PAR)
33 # include "GranSimRts.h"
40 extern void __stginit_ZCMain(void);
42 /* Hack: we assume that we're building a batch-mode system unless
45 #ifndef INTERPRETER /* Hack */
46 int main(int argc, char *argv[])
49 SchedulerStatus status;
50 /* all GranSim/GUM init is done in startupHaskell; sets IAmMainThread! */
53 startupHaskell(argc,argv,__stginit_ZCMain);
55 /* kick off the computation by creating the main thread with a pointer
56 to mainIO_closure representing the computation of the overall program;
57 then enter the scheduler with this thread and off we go;
59 the same for GranSim (we have only one instance of this code)
61 in a parallel setup, where we have many instances of this code
62 running on different PEs, we should do this only for the main PE
63 (IAmMainThread is set in startupHaskell)
69 { /* a wait loop to allow attachment of gdb to UNIX threads */
72 for (i=0, s=0; i<(nat)RtsFlags.ParFlags.wait; i++)
73 for (j=0; j<1000000; j++)
77 belch("Passed wait loop"));
80 if (IAmMainThread == rtsTrue) {
82 debugBelch("==== [%x] Main Thread Started ...\n", mytid));
84 /* ToDo: Dump event for the main thread */
85 status = rts_mainLazyIO((HaskellObj)mainIO_closure, NULL);
87 /* Just to show we're alive */
89 debugBelch("== [%x] Non-Main PE enters scheduler via taskStart() without work ...\n",
92 /* all non-main threads enter the scheduler without work */
94 status = Success; // declare victory (see shutdownParallelSystem)
99 /* ToDo: Dump event for the main thread */
100 status = rts_mainLazyIO(mainIO_closure, NULL);
102 # else /* !PAR && !GRAN */
104 /* ToDo: want to start with a larger stack size */
106 Capability *cap = rts_lock();
107 cap = rts_evalLazyIO(cap,(HaskellObj)(void *)mainIO_closure, NULL);
108 status = rts_getSchedStatus(cap);
109 taskTimeStamp(myTask());
113 # endif /* !PAR && !GRAN */
115 /* check the status of the entire Haskell computation */
118 errorBelch("main thread exited (uncaught exception)");
119 exit_status = EXIT_KILLED;
122 errorBelch("interrupted");
123 exit_status = EXIT_INTERRUPTED;
126 exit_status = EXIT_SUCCESS;
130 errorBelch("main thread PE killed; probably due to failure of another PE; check /tmp/pvml...");
131 exit_status = EXIT_KILLED;
135 barf("main thread completed with invalid status");
137 shutdownHaskellAndExit(exit_status);
139 return 0; /* not reached unless a Windows exception happens,
140 also keeps gcc -Wall happy */
142 # endif /* BATCH_MODE */