1 /* -----------------------------------------------------------------------------
3 * (c) The GHC Team, 1998-2002
5 * Main function for a standalone Haskell program.
7 * ---------------------------------------------------------------------------*/
9 #include "PosixSource.h"
14 #include "OSThreads.h"
15 #include "Storage.h" /* initStorage, exitStorage */
16 #include "Schedule.h" /* initScheduler */
17 #include "Stats.h" /* initStats */
18 #include "STM.h" /* initSTM */
20 #include "Timer.h" /* startTimer, stopTimer */
24 #include "Prelude.h" /* fixupRTStoPreludeRefs */
27 #include "ThreadLabels.h"
28 #include "BlockAlloc.h"
30 #if defined(RTS_GTK_FRONTPANEL)
31 #include "FrontPanel.h"
34 #if defined(PROFILING) || defined(DEBUG)
35 # include "Profiling.h"
36 # include "ProfHeap.h"
37 # include "RetainerProfile.h"
41 # include "GranSimRts.h"
44 #if defined(GRAN) || defined(PAR)
45 # include "ParallelRts.h"
49 # include "Parallel.h"
53 #if defined(mingw32_HOST_OS)
54 #include "win32/AsyncIO.h"
66 // Count of how many outstanding hs_init()s there have been.
67 static int hs_init_count = 0;
69 // Here we save the terminal settings on the standard file
70 // descriptors, if we need to change them (eg. to support NoBuffering
72 static void *saved_termios[3] = {NULL,NULL,NULL};
75 __hscore_get_saved_termios(int fd)
77 return (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) ?
78 saved_termios[fd] : NULL;
82 __hscore_set_saved_termios(int fd, void* ts)
84 if (0 <= fd && fd < (int)(sizeof(saved_termios) / sizeof(*saved_termios))) {
85 saved_termios[fd] = ts;
89 /* -----------------------------------------------------------------------------
90 Initialise floating point unit on x86 (currently disabled. why?)
91 -------------------------------------------------------------------------- */
93 #define X86_INIT_FPU 0
99 __volatile unsigned short int fpu_cw;
101 // Grab the control word
102 __asm __volatile ("fnstcw %0" : "=m" (fpu_cw));
105 printf("fpu_cw: %x\n", fpu_cw);
108 // Set bits 8-9 to 10 (64-bit precision).
109 fpu_cw = (fpu_cw & 0xfcff) | 0x0200;
111 // Store the new control word back
112 __asm __volatile ("fldcw %0" : : "m" (fpu_cw));
116 /* -----------------------------------------------------------------------------
118 -------------------------------------------------------------------------- */
121 hs_init(int *argc, char **argv[])
124 if (hs_init_count > 1) {
125 // second and subsequent inits are ignored
129 /* The very first thing we do is grab the start time...just in case we're
130 * collecting timing statistics.
136 * The parallel system needs to be initialised and synchronised before
137 * the program is run.
139 startupParallelSystem(argv);
141 if (*argv[0] == '-') { /* Strip off mainPE flag argument */
146 argv[1] = argv[0]; /* ignore the nPEs argument */
150 /* Set the RTS flags to default values. */
151 initRtsFlagsDefaults();
153 /* Call the user hook to reset defaults, if present */
156 /* Parse the flags, separating the RTS flags from the programs args */
157 if (argc != NULL && argv != NULL) {
158 setupRtsFlags(argc, *argv, &rts_argc, rts_argv);
159 setProgArgv(*argc,*argv);
163 /* NB: this really must be done after processing the RTS flags */
164 IF_PAR_DEBUG(verbose,
165 debugBelch("==== Synchronising system (%d PEs)\n", nPEs));
166 synchroniseSystem(); // calls initParallelSystem etc
169 /* Perform initialisation of adjustor thunk layer. */
172 /* initialise scheduler data structures (needs to be done before
178 /* And start GranSim profiling if required: */
179 if (RtsFlags.GranFlags.GranSimStats.Full)
180 init_gr_simulation(rts_argc, rts_argv, prog_argc, prog_argv);
182 /* And start GUM profiling if required: */
183 if (RtsFlags.ParFlags.ParStats.Full)
184 init_gr_simulation(rts_argc, rts_argv, prog_argc, prog_argv);
185 #endif /* PAR || GRAN */
187 /* initialize the storage manager */
190 /* initialise the stable pointer table */
191 initStablePtrTable();
194 /* initialise thread label table (tso->char*) */
195 initThreadLabelTable();
198 #if defined(PROFILING) || defined(DEBUG)
202 /* start the virtual timer 'subsystem'. */
203 startTimer(TICK_MILLISECS);
205 /* Initialise the stats department */
208 #if defined(RTS_USER_SIGNALS)
209 /* Initialise the user signal handler set */
211 /* Set up handler to run on SIGINT, etc. */
212 initDefaultHandlers();
215 #if defined(mingw32_HOST_OS)
221 #ifdef RTS_GTK_FRONTPANEL
222 if (RtsFlags.GcFlags.frontpanel) {
231 /* Record initialization times */
235 // Compatibility interface
237 startupHaskell(int argc, char *argv[], void (*init_root)(void))
239 hs_init(&argc, &argv);
241 hs_add_root(init_root);
245 /* -----------------------------------------------------------------------------
246 Per-module initialisation
248 This process traverses all the compiled modules in the program
249 starting with "Main", and performing per-module initialisation for
252 So far, two things happen at initialisation time:
254 - we register stable names for each foreign-exported function
255 in that module. This prevents foreign-exported entities, and
256 things they depend on, from being garbage collected.
258 - we supply a unique integer to each statically declared cost
259 centre and cost centre stack in the program.
261 The code generator inserts a small function "__stginit_<module>" in each
262 module and calls the registration functions in each of the modules it
265 The init* functions are compiled in the same way as STG code,
266 i.e. without normal C call/return conventions. Hence we must use
267 StgRun to call this stuff.
268 -------------------------------------------------------------------------- */
270 /* The init functions use an explicit stack...
272 #define INIT_STACK_BLOCKS 4
273 static F_ *init_stack = NULL;
276 hs_add_root(void (*init_root)(void))
282 #define cap MainCapability
286 if (hs_init_count <= 0) {
287 barf("hs_add_root() must be called after hs_init()");
290 /* The initialisation stack grows downward, with sp pointing
291 to the last occupied word */
292 init_sp = INIT_STACK_BLOCKS*BLOCK_SIZE_W;
293 bd = allocGroup(INIT_STACK_BLOCKS);
294 init_stack = (F_ *)bd->start;
295 init_stack[--init_sp] = (F_)stg_init_finish;
296 if (init_root != NULL) {
297 init_stack[--init_sp] = (F_)init_root;
300 cap.r.rSp = (P_)(init_stack + init_sp);
301 StgRun((StgFunPtr)stg_init, &cap.r);
305 #if defined(PROFILING) || defined(DEBUG)
306 // This must be done after module initialisation.
307 // ToDo: make this work in the presence of multiple hs_add_root()s.
312 /* -----------------------------------------------------------------------------
313 Shutting down the RTS
314 -------------------------------------------------------------------------- */
319 if (hs_init_count <= 0) {
320 barf("too many hs_exit()s");
323 if (hs_init_count > 0) {
324 // ignore until it's the last one
328 /* start timing the shutdown */
331 /* stop all running tasks */
335 /* end_gr_simulation prints global stats if requested -- HWL */
336 if (!RtsFlags.GranFlags.GranSimStats.Suppressed)
340 /* stop the ticker */
343 /* reset the standard file descriptors to blocking mode */
344 resetNonBlockingFd(0);
345 resetNonBlockingFd(1);
346 resetNonBlockingFd(2);
349 // Reset the terminal settings on the standard file descriptors,
350 // if we changed them. See System.Posix.Internals.tcSetAttr for
351 // more details, including the reason we termporarily disable
355 sigset_t sigset, old_sigset;
356 sigemptyset(&sigset);
357 sigaddset(&sigset, SIGTTOU);
358 sigprocmask(SIG_BLOCK, &sigset, &old_sigset);
359 for (fd = 0; fd <= 2; fd++) {
360 struct termios* ts = (struct termios*)__hscore_get_saved_termios(fd);
362 tcsetattr(fd,TCSANOW,ts);
365 sigprocmask(SIG_SETMASK, &old_sigset, NULL);
370 /* controlled exit; good thread! */
371 shutdownParallelSystem(0);
373 /* global statistics in parallel system */
377 /* stop timing the shutdown, we're about to print stats */
380 /* clean up things from the storage manager's point of view.
381 * also outputs the stats (+RTS -s) info.
385 #ifdef RTS_GTK_FRONTPANEL
386 if (RtsFlags.GcFlags.frontpanel) {
391 #if defined(PROFILING)
392 reportCCSProfiling();
395 #if defined(PROFILING) || defined(DEBUG)
400 // Originally, this was in report_ccs_profiling(). Now, retainer
401 // profiling might tack some extra stuff on to the end of this file
402 // during endProfiling().
406 #if defined(TICKY_TICKY)
407 if (RtsFlags.TickyFlags.showTickyStats) PrintTickyInfo();
410 #if defined(mingw32_HOST_OS)
415 // Compatibility interfaces
417 shutdownHaskell(void)
423 shutdownHaskellAndExit(int n)
425 if (hs_init_count == 1) {
429 /* really exit (stg_exit() would call shutdownParallelSystem() again) */
438 * called from STG-land to exit the program
442 static int exit_started=rtsFalse;
449 /* HACK: avoid a loop when exiting due to a stupid error */
452 exit_started=rtsTrue;
454 IF_PAR_DEBUG(verbose, debugBelch("==-- stg_exit %d on [%x]...", n, mytid));
455 shutdownParallelSystem(n);