1 /* -----------------------------------------------------------------------------
2 * $Id: RtsStartup.c,v 1.82 2004/08/21 12:48:00 panne Exp $
4 * (c) The GHC Team, 1998-2002
6 * Main function for a standalone Haskell program.
8 * ---------------------------------------------------------------------------*/
10 #include "PosixSource.h"
15 #include "Storage.h" /* initStorage, exitStorage */
16 #include "Schedule.h" /* initScheduler */
17 #include "Stats.h" /* initStats */
19 #include "Timer.h" /* startTimer, stopTimer */
23 #include "Prelude.h" /* fixupRTStoPreludeRefs */
26 #include "ThreadLabels.h"
27 #include "BlockAlloc.h"
29 #if defined(RTS_GTK_FRONTPANEL)
30 #include "FrontPanel.h"
33 #if defined(PROFILING) || defined(DEBUG)
34 # include "Profiling.h"
35 # include "ProfHeap.h"
36 # include "RetainerProfile.h"
40 # include "GranSimRts.h"
43 #if defined(GRAN) || defined(PAR)
44 # include "ParallelRts.h"
48 # include "Parallel.h"
52 #if defined(mingw32_TARGET_OS)
53 #include "win32/AsyncIO.h"
69 // Count of how many outstanding hs_init()s there have been.
70 static int hs_init_count = 0;
72 // Here we save the terminal settings on the standard file
73 // descriptors, if we need to change them (eg. to support NoBuffering
75 static void *saved_termios[3] = {NULL,NULL,NULL};
78 __hscore_get_saved_termios(int fd)
80 return (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) ?
81 saved_termios[fd] : NULL;
85 __hscore_set_saved_termios(int fd, void* ts)
87 if (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) {
88 saved_termios[fd] = ts;
93 static void x86_init_fpu ( void );
96 /* -----------------------------------------------------------------------------
98 -------------------------------------------------------------------------- */
101 hs_init(int *argc, char **argv[])
104 if (hs_init_count > 1) {
105 // second and subsequent inits are ignored
109 /* The very first thing we do is grab the start time...just in case we're
110 * collecting timing statistics.
116 * The parallel system needs to be initialised and synchronised before
117 * the program is run.
119 startupParallelSystem(argv);
121 if (*argv[0] == '-') { /* Strip off mainPE flag argument */
126 argv[1] = argv[0]; /* ignore the nPEs argument */
130 /* Set the RTS flags to default values. */
131 initRtsFlagsDefaults();
133 /* Call the user hook to reset defaults, if present */
136 /* Parse the flags, separating the RTS flags from the programs args */
137 if (argc != NULL && argv != NULL) {
138 setupRtsFlags(argc, *argv, &rts_argc, rts_argv);
144 /* NB: this really must be done after processing the RTS flags */
145 IF_PAR_DEBUG(verbose,
146 fprintf(stderr, "==== Synchronising system (%d PEs)\n", nPEs));
147 synchroniseSystem(); // calls initParallelSystem etc
150 /* Perform initialisation of adjustor thunk layer. */
153 /* initialise scheduler data structures (needs to be done before
159 /* And start GranSim profiling if required: */
160 if (RtsFlags.GranFlags.GranSimStats.Full)
161 init_gr_simulation(rts_argc, rts_argv, prog_argc, prog_argv);
163 /* And start GUM profiling if required: */
164 if (RtsFlags.ParFlags.ParStats.Full)
165 init_gr_simulation(rts_argc, rts_argv, prog_argc, prog_argv);
166 #endif /* PAR || GRAN */
168 /* initialize the storage manager */
171 /* initialise the stable pointer table */
172 initStablePtrTable();
174 /* initialise thread label table (tso->char*) */
175 initThreadLabelTable();
177 #if defined(PROFILING) || defined(DEBUG)
181 /* start the virtual timer 'subsystem'. */
182 startTimer(TICK_MILLISECS);
184 /* Initialise the stats department */
187 #if defined(RTS_USER_SIGNALS)
188 /* Initialise the user signal handler set */
190 /* Set up handler to run on SIGINT, etc. */
191 initDefaultHandlers();
194 #if defined(mingw32_TARGET_OS)
198 #ifdef RTS_GTK_FRONTPANEL
199 if (RtsFlags.GcFlags.frontpanel) {
205 setlocale(LC_CTYPE,"");
212 /* Record initialization times */
216 // Compatibility interface
218 startupHaskell(int argc, char *argv[], void (*init_root)(void))
220 hs_init(&argc, &argv);
221 hs_add_root(init_root);
225 /* -----------------------------------------------------------------------------
226 Getting/Setting the program's arguments.
228 These are used by System.Environment.
229 -------------------------------------------------------------------------- */
232 getProgArgv(int *argc, char **argv[])
234 if (argc) { *argc = prog_argc; }
235 if (argv) { *argv = prog_argv; }
239 setProgArgv(int argc, char *argv[])
241 /* Usually this is done by startupHaskell, so we don't need to call this.
242 However, sometimes Hugs wants to change the arguments which Haskell
243 getArgs >>= ... will be fed. So you can do that by calling here
244 _after_ calling startupHaskell.
250 /* -----------------------------------------------------------------------------
251 Per-module initialisation
253 This process traverses all the compiled modules in the program
254 starting with "Main", and performing per-module initialisation for
257 So far, two things happen at initialisation time:
259 - we register stable names for each foreign-exported function
260 in that module. This prevents foreign-exported entities, and
261 things they depend on, from being garbage collected.
263 - we supply a unique integer to each statically declared cost
264 centre and cost centre stack in the program.
266 The code generator inserts a small function "__stginit_<module>" in each
267 module and calls the registration functions in each of the modules it
270 The init* functions are compiled in the same way as STG code,
271 i.e. without normal C call/return conventions. Hence we must use
272 StgRun to call this stuff.
273 -------------------------------------------------------------------------- */
275 /* The init functions use an explicit stack...
277 #define INIT_STACK_BLOCKS 4
278 static F_ *init_stack = NULL;
281 hs_add_root(void (*init_root)(void))
287 #define cap MainCapability
291 if (hs_init_count <= 0) {
292 barf("hs_add_root() must be called after hs_init()");
295 /* The initialisation stack grows downward, with sp pointing
296 to the last occupied word */
297 init_sp = INIT_STACK_BLOCKS*BLOCK_SIZE_W;
298 bd = allocGroup(INIT_STACK_BLOCKS);
299 init_stack = (F_ *)bd->start;
300 init_stack[--init_sp] = (F_)stg_init_finish;
301 if (init_root != NULL) {
302 init_stack[--init_sp] = (F_)init_root;
305 cap.r.rSp = (P_)(init_stack + init_sp);
306 StgRun((StgFunPtr)stg_init, &cap.r);
310 #if defined(PROFILING) || defined(DEBUG)
311 // This must be done after module initialisation.
312 // ToDo: make this work in the presence of multiple hs_add_root()s.
317 /* -----------------------------------------------------------------------------
318 Shutting down the RTS
319 -------------------------------------------------------------------------- */
324 if (hs_init_count <= 0) {
325 barf("too many hs_exit()s");
328 if (hs_init_count > 0) {
329 // ignore until it's the last one
333 /* start timing the shutdown */
337 /* Finalize any remaining weak pointers */
338 finalizeWeakPointersNow();
341 /* stop all running tasks */
345 /* end_gr_simulation prints global stats if requested -- HWL */
346 if (!RtsFlags.GranFlags.GranSimStats.Suppressed)
350 /* stop the ticker */
353 /* reset the standard file descriptors to blocking mode */
354 resetNonBlockingFd(0);
355 resetNonBlockingFd(1);
356 resetNonBlockingFd(2);
359 // Reset the terminal settings on the standard file descriptors,
360 // if we changed them. See System.Posix.Internals.tcSetAttr for
361 // more details, including the reason we termporarily disable
365 sigset_t sigset, old_sigset;
366 sigemptyset(&sigset);
367 sigaddset(&sigset, SIGTTOU);
368 sigprocmask(SIG_BLOCK, &sigset, &old_sigset);
369 for (fd = 0; fd <= 2; fd++) {
370 struct termios* ts = (struct termios*)__hscore_get_saved_termios(fd);
372 tcsetattr(fd,TCSANOW,ts);
375 sigprocmask(SIG_SETMASK, &old_sigset, NULL);
380 /* controlled exit; good thread! */
381 shutdownParallelSystem(0);
383 /* global statistics in parallel system */
387 /* stop timing the shutdown, we're about to print stats */
390 /* clean up things from the storage manager's point of view.
391 * also outputs the stats (+RTS -s) info.
395 #ifdef RTS_GTK_FRONTPANEL
396 if (RtsFlags.GcFlags.frontpanel) {
401 #if defined(PROFILING)
402 reportCCSProfiling();
405 #if defined(PROFILING) || defined(DEBUG)
410 // Originally, this was in report_ccs_profiling(). Now, retainer
411 // profiling might tack some extra stuff on to the end of this file
412 // during endProfiling().
416 #if defined(TICKY_TICKY)
417 if (RtsFlags.TickyFlags.showTickyStats) PrintTickyInfo();
420 #if defined(mingw32_TARGET_OS)
425 // Compatibility interfaces
427 shutdownHaskell(void)
433 shutdownHaskellAndExit(int n)
435 if (hs_init_count == 1) {
439 /* really exit (stg_exit() would call shutdownParallelSystem() again) */
448 * called from STG-land to exit the program
452 static int exit_started=rtsFalse;
459 /* HACK: avoid a loop when exiting due to a stupid error */
462 exit_started=rtsTrue;
464 IF_PAR_DEBUG(verbose, fprintf(stderr,"==-- stg_exit %d on [%x]...", n, mytid));
465 shutdownParallelSystem(n);
470 /* -----------------------------------------------------------------------------
471 Initialise floating point unit on x86
472 -------------------------------------------------------------------------- */
476 x86_init_fpu ( void )
478 __volatile unsigned short int fpu_cw;
480 // Grab the control word
481 __asm __volatile ("fnstcw %0" : "=m" (fpu_cw));
484 printf("fpu_cw: %x\n", fpu_cw);
487 // Set bits 8-9 to 10 (64-bit precision).
488 fpu_cw = (fpu_cw & 0xfcff) | 0x0200;
490 // Store the new control word back
491 __asm __volatile ("fldcw %0" : : "m" (fpu_cw));