1 /* -----------------------------------------------------------------------------
3 * (c) The GHC Team, 1998-2002
5 * Main function for a standalone Haskell program.
7 * ---------------------------------------------------------------------------*/
9 #include "PosixSource.h"
14 #include "Storage.h" /* initStorage, exitStorage */
15 #include "Schedule.h" /* initScheduler */
16 #include "Stats.h" /* initStats */
17 #include "STM.h" /* initSTM */
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_HOST_OS)
53 #include "win32/AsyncIO.h"
65 // Count of how many outstanding hs_init()s there have been.
66 static int hs_init_count = 0;
68 // Here we save the terminal settings on the standard file
69 // descriptors, if we need to change them (eg. to support NoBuffering
71 static void *saved_termios[3] = {NULL,NULL,NULL};
74 __hscore_get_saved_termios(int fd)
76 return (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) ?
77 saved_termios[fd] : NULL;
81 __hscore_set_saved_termios(int fd, void* ts)
83 if (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) {
84 saved_termios[fd] = ts;
88 /* -----------------------------------------------------------------------------
89 Initialise floating point unit on x86 (currently disabled. why?)
90 -------------------------------------------------------------------------- */
92 #define X86_INIT_FPU 0
98 __volatile unsigned short int fpu_cw;
100 // Grab the control word
101 __asm __volatile ("fnstcw %0" : "=m" (fpu_cw));
104 printf("fpu_cw: %x\n", fpu_cw);
107 // Set bits 8-9 to 10 (64-bit precision).
108 fpu_cw = (fpu_cw & 0xfcff) | 0x0200;
110 // Store the new control word back
111 __asm __volatile ("fldcw %0" : : "m" (fpu_cw));
115 /* -----------------------------------------------------------------------------
117 -------------------------------------------------------------------------- */
120 hs_init(int *argc, char **argv[])
123 if (hs_init_count > 1) {
124 // second and subsequent inits are ignored
128 /* The very first thing we do is grab the start time...just in case we're
129 * collecting timing statistics.
135 * The parallel system needs to be initialised and synchronised before
136 * the program is run.
138 startupParallelSystem(argv);
140 if (*argv[0] == '-') { /* Strip off mainPE flag argument */
145 argv[1] = argv[0]; /* ignore the nPEs argument */
149 /* Set the RTS flags to default values. */
150 initRtsFlagsDefaults();
152 /* Call the user hook to reset defaults, if present */
155 /* Parse the flags, separating the RTS flags from the programs args */
156 if (argc != NULL && argv != NULL) {
157 setupRtsFlags(argc, *argv, &rts_argc, rts_argv);
158 setProgArgv(*argc,*argv);
162 /* NB: this really must be done after processing the RTS flags */
163 IF_PAR_DEBUG(verbose,
164 debugBelch("==== Synchronising system (%d PEs)\n", nPEs));
165 synchroniseSystem(); // calls initParallelSystem etc
168 /* Perform initialisation of adjustor thunk layer. */
171 /* initialise scheduler data structures (needs to be done before
177 /* And start GranSim profiling if required: */
178 if (RtsFlags.GranFlags.GranSimStats.Full)
179 init_gr_simulation(rts_argc, rts_argv, prog_argc, prog_argv);
181 /* And start GUM profiling if required: */
182 if (RtsFlags.ParFlags.ParStats.Full)
183 init_gr_simulation(rts_argc, rts_argv, prog_argc, prog_argv);
184 #endif /* PAR || GRAN */
186 /* initialize the storage manager */
189 /* initialise the stable pointer table */
190 initStablePtrTable();
193 /* initialise thread label table (tso->char*) */
194 initThreadLabelTable();
197 #if defined(PROFILING) || defined(DEBUG)
201 /* start the virtual timer 'subsystem'. */
202 startTimer(TICK_MILLISECS);
204 /* Initialise the stats department */
207 #if defined(RTS_USER_SIGNALS)
208 /* Initialise the user signal handler set */
210 /* Set up handler to run on SIGINT, etc. */
211 initDefaultHandlers();
214 #if defined(mingw32_HOST_OS)
220 #ifdef RTS_GTK_FRONTPANEL
221 if (RtsFlags.GcFlags.frontpanel) {
230 /* Record initialization times */
234 // Compatibility interface
236 startupHaskell(int argc, char *argv[], void (*init_root)(void))
238 hs_init(&argc, &argv);
239 hs_add_root(init_root);
243 /* -----------------------------------------------------------------------------
244 Per-module initialisation
246 This process traverses all the compiled modules in the program
247 starting with "Main", and performing per-module initialisation for
250 So far, two things happen at initialisation time:
252 - we register stable names for each foreign-exported function
253 in that module. This prevents foreign-exported entities, and
254 things they depend on, from being garbage collected.
256 - we supply a unique integer to each statically declared cost
257 centre and cost centre stack in the program.
259 The code generator inserts a small function "__stginit_<module>" in each
260 module and calls the registration functions in each of the modules it
263 The init* functions are compiled in the same way as STG code,
264 i.e. without normal C call/return conventions. Hence we must use
265 StgRun to call this stuff.
266 -------------------------------------------------------------------------- */
268 /* The init functions use an explicit stack...
270 #define INIT_STACK_BLOCKS 4
271 static F_ *init_stack = NULL;
274 hs_add_root(void (*init_root)(void))
280 #define cap MainCapability
284 if (hs_init_count <= 0) {
285 barf("hs_add_root() must be called after hs_init()");
288 /* The initialisation stack grows downward, with sp pointing
289 to the last occupied word */
290 init_sp = INIT_STACK_BLOCKS*BLOCK_SIZE_W;
291 bd = allocGroup(INIT_STACK_BLOCKS);
292 init_stack = (F_ *)bd->start;
293 init_stack[--init_sp] = (F_)stg_init_finish;
294 if (init_root != NULL) {
295 init_stack[--init_sp] = (F_)init_root;
298 cap.r.rSp = (P_)(init_stack + init_sp);
299 StgRun((StgFunPtr)stg_init, &cap.r);
303 #if defined(PROFILING) || defined(DEBUG)
304 // This must be done after module initialisation.
305 // ToDo: make this work in the presence of multiple hs_add_root()s.
310 /* -----------------------------------------------------------------------------
311 Shutting down the RTS
312 -------------------------------------------------------------------------- */
317 if (hs_init_count <= 0) {
318 barf("too many hs_exit()s");
321 if (hs_init_count > 0) {
322 // ignore until it's the last one
326 /* start timing the shutdown */
329 /* stop all running tasks */
333 /* end_gr_simulation prints global stats if requested -- HWL */
334 if (!RtsFlags.GranFlags.GranSimStats.Suppressed)
338 /* stop the ticker */
341 /* reset the standard file descriptors to blocking mode */
342 resetNonBlockingFd(0);
343 resetNonBlockingFd(1);
344 resetNonBlockingFd(2);
347 // Reset the terminal settings on the standard file descriptors,
348 // if we changed them. See System.Posix.Internals.tcSetAttr for
349 // more details, including the reason we termporarily disable
353 sigset_t sigset, old_sigset;
354 sigemptyset(&sigset);
355 sigaddset(&sigset, SIGTTOU);
356 sigprocmask(SIG_BLOCK, &sigset, &old_sigset);
357 for (fd = 0; fd <= 2; fd++) {
358 struct termios* ts = (struct termios*)__hscore_get_saved_termios(fd);
360 tcsetattr(fd,TCSANOW,ts);
363 sigprocmask(SIG_SETMASK, &old_sigset, NULL);
368 /* controlled exit; good thread! */
369 shutdownParallelSystem(0);
371 /* global statistics in parallel system */
375 /* stop timing the shutdown, we're about to print stats */
378 /* clean up things from the storage manager's point of view.
379 * also outputs the stats (+RTS -s) info.
383 #ifdef RTS_GTK_FRONTPANEL
384 if (RtsFlags.GcFlags.frontpanel) {
389 #if defined(PROFILING)
390 reportCCSProfiling();
393 #if defined(PROFILING) || defined(DEBUG)
398 // Originally, this was in report_ccs_profiling(). Now, retainer
399 // profiling might tack some extra stuff on to the end of this file
400 // during endProfiling().
404 #if defined(TICKY_TICKY)
405 if (RtsFlags.TickyFlags.showTickyStats) PrintTickyInfo();
408 #if defined(mingw32_HOST_OS)
413 // Compatibility interfaces
415 shutdownHaskell(void)
421 shutdownHaskellAndExit(int n)
423 if (hs_init_count == 1) {
427 /* really exit (stg_exit() would call shutdownParallelSystem() again) */
436 * called from STG-land to exit the program
440 static int exit_started=rtsFalse;
447 /* HACK: avoid a loop when exiting due to a stupid error */
450 exit_started=rtsTrue;
452 IF_PAR_DEBUG(verbose, debugBelch("==-- stg_exit %d on [%x]...", n, mytid));
453 shutdownParallelSystem(n);