QNX Multithreading (thread 1 reads number every 20ms, thread 2 computes every 10ms)

#include <pthread.h>
#include <stdio.h>
#include <sys/time.h>
#include <string.h>
#include <unistd.h>
#define MAX 10

pthread_t thread[2];
pthread_mutex_t Mut;
int number=0,i;

void *thread1 ()
{
while (1)
{
Number=i;
printf ("thread1:number=%d\n", number);
Delay (20);
}
}

void *thread2 ()
{
for (i = 0; i < max*100; i++)
{
Delay (10);
}
Pthread_exit (NULL);
}

int main ()
{
clock_t Start,end;
Start=clock ();
Pthread_create (&thread[0], NULL, THREAD1, NULL);
Pthread_create (&thread[1], NULL, THREAD2, NULL);
Pthread_join (Thread[0],null);
Pthread_join (Thread[1],null);
End=clock ();
printf ("The time is%lf s!\n", (Double) ((End-start)/clocks_per_sec));
return 0;
}

The results show:

Thread1:number=0
Thread1:number=1
Thread1:number=3
Thread1:number=5
Thread1:number=7
Thread1:number=9
thread1:number=11
Thread1:number=12
Thread1:number=14
Thread1:number=16
Thread1:number=18
Thread1:number=20
Thread1:number=22
Thread1:number=23
Thread1:number=25
Thread1:number=27
thread1:number=29
Thread1:number=31
Thread1:number=33
Thread1:number=34
thread1:number=36
thread1:number=38
Thread1:number=40
Thread1:number=42
Thread1:number=44
Thread1:number=45
thread1:number=47
thread1:number=49
thread1:number=51
thread1:number=53
Thread1:number=55
thread1:number=56
thread1:number=58
Thread1:number=60
thread1:number=62
Thread1:number=64
thread1:number=66
thread1:number=67
thread1:number=69
thread1:number=71
thread1:number=73
Thread1:number=75
thread1:number=77
thread1:number=78
Thread1:number=80
thread1:number=82
thread1:number=84
Thread1:number=86
thread1:number=88
thread1:number=89
thread1:number=91
thread1:number=93
Thread1:number=95
thread1:number=97
thread1:number=99
thread1:number=100
thread1:number=102
thread1:number=104
thread1:number=106
thread1:number=108
thread1:number=110
thread1:number=111
thread1:number=113
thread1:number=115
thread1:number=117
thread1:number=119
thread1:number=121
thread1:number=122
thread1:number=124
thread1:number=126
thread1:number=128
thread1:number=130
thread1:number=132
thread1:number=133
thread1:number=135
thread1:number=137
thread1:number=139
thread1:number=141
thread1:number=143
thread1:number=144
thread1:number=146
thread1:number=148
thread1:number=150
thread1:number=152
thread1:number=154
thread1:number=155
thread1:number=157
thread1:number=159
thread1:number=161
thread1:number=163
thread1:number=165
thread1:number=166
thread1:number=168
thread1:number=170
thread1:number=172
thread1:number=174
thread1:number=176
thread1:number=177
thread1:number=179
thread1:number=181
thread1:number=183
thread1:number=185
thread1:number=187
thread1:number=188
thread1:number=190
thread1:number=192
thread1:number=194
thread1:number=196
thread1:number=198
thread1:number=199
thread1:number=201
thread1:number=203
thread1:number=205
thread1:number=207
thread1:number=209
thread1:number=210
thread1:number=212
thread1:number=214
thread1:number=216
thread1:number=218
thread1:number=220
thread1:number=221
thread1:number=223
thread1:number=225
thread1:number=227
thread1:number=229
thread1:number=231
thread1:number=232
thread1:number=234
thread1:number=236
thread1:number=238
thread1:number=240
thread1:number=242
thread1:number=243
thread1:number=245
thread1:number=247
thread1:number=249
thread1:number=251
thread1:number=253
thread1:number=254
thread1:number=256
thread1:number=258
thread1:number=260
thread1:number=262
thread1:number=264
thread1:number=265
thread1:number=267
thread1:number=269
thread1:number=271
thread1:number=273
thread1:number=275
thread1:number=276
thread1:number=278
thread1:number=280
thread1:number=282
thread1:number=284
thread1:number=286
thread1:number=287
thread1:number=289
thread1:number=291
thread1:number=293
thread1:number=295
thread1:number=297
thread1:number=298
thread1:number=300
thread1:number=302
thread1:number=304
thread1:number=306
thread1:number=308
thread1:number=309
thread1:number=311
thread1:number=313
thread1:number=315
thread1:number=317
thread1:number=319
thread1:number=320
thread1:number=322
thread1:number=324
thread1:number=326
thread1:number=328
thread1:number=330
thread1:number=331
thread1:number=333
thread1:number=335
thread1:number=337
thread1:number=339
thread1:number=341
thread1:number=342
thread1:number=344
thread1:number=346
thread1:number=348
thread1:number=350
thread1:number=352
thread1:number=353
thread1:number=355
thread1:number=357
thread1:number=359
thread1:number=361
thread1:number=363
thread1:number=364
thread1:number=366
thread1:number=368
thread1:number=370
thread1:number=372
thread1:number=374
thread1:number=375
thread1:number=377
thread1:number=379
thread1:number=381
thread1:number=383
thread1:number=385
Thread1:number=386
thread1:number=388
thread1:number=390
thread1:number=392
thread1:number=394
thread1:number=396
thread1:number=397
thread1:number=399
thread1:number=401
thread1:number=403
thread1:number=405
thread1:number=407
thread1:number=408
thread1:number=410
thread1:number=412
thread1:number=414
thread1:number=416
thread1:number=418
thread1:number=419
thread1:number=421
thread1:number=423
thread1:number=425
thread1:number=427
thread1:number=429
thread1:number=430
thread1:number=432
thread1:number=434
thread1:number=436
thread1:number=438
thread1:number=440
thread1:number=441
thread1:number=443
thread1:number=445
thread1:number=447
thread1:number=449
thread1:number=451
thread1:number=452
thread1:number=454
thread1:number=456
thread1:number=458
thread1:number=460
thread1:number=462
thread1:number=463
thread1:number=465
thread1:number=467
thread1:number=469
thread1:number=471
thread1:number=473
thread1:number=474
thread1:number=476
thread1:number=478
thread1:number=480
thread1:number=482
thread1:number=484
thread1:number=485
thread1:number=487
thread1:number=489
thread1:number=491
thread1:number=493
thread1:number=495
thread1:number=496
thread1:number=498
thread1:number=500
thread1:number=502
thread1:number=504
thread1:number=506
thread1:number=507
thread1:number=509
thread1:number=511
thread1:number=513
thread1:number=515
thread1:number=517
thread1:number=518
thread1:number=520
thread1:number=522
thread1:number=524
thread1:number=526
thread1:number=528
thread1:number=529
thread1:number=531
thread1:number=533
thread1:number=535
thread1:number=537
thread1:number=539
thread1:number=540
thread1:number=542
thread1:number=544
thread1:number=546
thread1:number=548
thread1:number=550
thread1:number=551
thread1:number=553
thread1:number=555
thread1:number=557
thread1:number=559
thread1:number=561
thread1:number=562
thread1:number=564
thread1:number=566
thread1:number=568
thread1:number=570
thread1:number=572
thread1:number=573
thread1:number=575
thread1:number=577
thread1:number=579
thread1:number=581
thread1:number=583
thread1:number=584
thread1:number=586
thread1:number=588
thread1:number=590
thread1:number=592
thread1:number=594
thread1:number=595
thread1:number=597
thread1:number=599
thread1:number=601
thread1:number=603
thread1:number=605
thread1:number=606
thread1:number=608
thread1:number=610
thread1:number=612
thread1:number=614
thread1:number=616
thread1:number=617
thread1:number=619
thread1:number=621
thread1:number=623
thread1:number=625
thread1:number=627
thread1:number=628
thread1:number=630
thread1:number=632
thread1:number=634
thread1:number=636
thread1:number=638
thread1:number=639
thread1:number=641
thread1:number=643
thread1:number=645
thread1:number=647
thread1:number=649
thread1:number=650
thread1:number=652
thread1:number=654
thread1:number=656
thread1:number=658
thread1:number=660
thread1:number=661
thread1:number=663
thread1:number=665
thread1:number=667
thread1:number=669
thread1:number=671
thread1:number=672
thread1:number=674
thread1:number=676
thread1:number=678
thread1:number=680
thread1:number=682
thread1:number=683
thread1:number=685
thread1:number=687
thread1:number=689
thread1:number=691
thread1:number=693
thread1:number=694
thread1:number=696
thread1:number=698
thread1:number=700
thread1:number=702
thread1:number=704
thread1:number=705
thread1:number=707
thread1:number=709
thread1:number=711
thread1:number=713
thread1:number=715
thread1:number=716
thread1:number=718
thread1:number=720
thread1:number=722
thread1:number=724
thread1:number=726
thread1:number=727
thread1:number=729
thread1:number=731
thread1:number=733
thread1:number=735
thread1:number=737
thread1:number=738
thread1:number=740
thread1:number=742
thread1:number=744
thread1:number=746
thread1:number=748
thread1:number=749
thread1:number=751
thread1:number=753
thread1:number=755
thread1:number=757
thread1:number=759
thread1:number=760
thread1:number=762
thread1:number=764
thread1:number=766
thread1:number=768
thread1:number=770
thread1:number=771
thread1:number=773
thread1:number=775
thread1:number=777
thread1:number=779
thread1:number=781
thread1:number=782
thread1:number=784
thread1:number=786
thread1:number=788
thread1:number=790
thread1:number=792
thread1:number=793
thread1:number=795
thread1:number=797
thread1:number=799
thread1:number=801
thread1:number=803
thread1:number=804
thread1:number=806
thread1:number=808
thread1:number=810
thread1:number=812
thread1:number=814
thread1:number=815
thread1:number=817
thread1:number=819
thread1:number=821
thread1:number=823
thread1:number=825
thread1:number=826
thread1:number=828
thread1:number=830
thread1:number=832
thread1:number=834
thread1:number=836
thread1:number=837
thread1:number=839
thread1:number=841
thread1:number=843
thread1:number=845
thread1:number=847
thread1:number=848
thread1:number=850
thread1:number=852
thread1:number=854
thread1:number=856
thread1:number=857
thread1:number=859
thread1:number=861
thread1:number=863
thread1:number=865
thread1:number=867
thread1:number=868
thread1:number=870
thread1:number=872
thread1:number=874
thread1:number=876
thread1:number=878
thread1:number=879
thread1:number=881
thread1:number=883
thread1:number=885
thread1:number=887
thread1:number=889
thread1:number=890
thread1:number=892
thread1:number=894
thread1:number=896
thread1:number=898
thread1:number=900
thread1:number=901
thread1:number=903
thread1:number=905
thread1:number=907
thread1:number=909
thread1:number=911
thread1:number=912
thread1:number=914
thread1:number=916
thread1:number=918
thread1:number=920
thread1:number=922
thread1:number=923
thread1:number=925
thread1:number=927
thread1:number=929
thread1:number=931
thread1:number=933
thread1:number=935
thread1:number=936
thread1:number=938
thread1:number=940
thread1:number=942
thread1:number=944
thread1:number=946
thread1:number=947
thread1:number=949
thread1:number=951
thread1:number=953
thread1:number=955
thread1:number=957
thread1:number=958
thread1:number=960
thread1:number=962
thread1:number=964
thread1:number=966
thread1:number=968
thread1:number=969
thread1:number=971
thread1:number=973
thread1:number=975
thread1:number=977
thread1:number=979
thread1:number=980
thread1:number=982
thread1:number=984
thread1:number=986
thread1:number=988
thread1:number=990
thread1:number=991
thread1:number=993
thread1:number=995
thread1:number=997
thread1:number=999
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000
thread1:number=1000

QNX Multithreading (thread 1 reads number every 20ms, thread 2 computes every 10ms)