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The threads demo would display negative prime numbers

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on MacOS X; this appears to be a MacOS X bug, but we
added a workaround to "fix" this (STR #1138)



git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@4740 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Michael R Sweet 2006-01-06 16:53:04 +00:00
parent e0a8bd61e7
commit 741322a01a
3 changed files with 15 additions and 4 deletions
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3
CHANGES
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@ -3,6 +3,9 @@ CHANGES IN FLTK 1.1.7
- Documentation fixes (STR #571, STR #648, STR #692, STR
#730, STR #744, STR #745, STR #931, STR #942, STR #960,
STR #969)
- The threads demo would display negative prime numbers
on MacOS X; this appears to be a MacOS X bug, but we
added a workaround to "fix" this (STR #1138)
- Fl::dnd() now sets the content type of the drag to
"text/uri-list" when it sees the dragged text is
composed of URIs.

11
test/threads.cxx
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@ -61,9 +61,10 @@ void* prime_func(void* p)
}
// very simple prime number calculator !
for (; ; n+= step) {
for (;;) {
int p;
int hn = (int)sqrt((double)n);
for (p=3; p<=hn; p+=2) if ( n%p == 0 ) break;
if (p >= hn) {
char s[128];
@ -72,8 +73,16 @@ void* prime_func(void* p)
browser->add(s);
browser->bottomline(browser->size());
if (n > value->value()) value->value(n);
n += step;
Fl::unlock();
Fl::awake((void*) (browser == browser1? p:0)); // Cause the browser to redraw ...
} else {
// This should not be necessary since "n" and "step" a local variables,
// however it appears that at least MacOS X has some threading issues
// that cause semi-random corruption of the (stack) variables.
Fl::lock();
n += step;
Fl::unlock();
}
}
return 0;

5
test/threads.h
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@ -50,9 +50,8 @@
typedef pthread_t Fl_Thread;
static int fl_create_thread(Fl_Thread& t, void *(*f) (void *), void* p)
{
return pthread_create((pthread_t*)&t, 0, f, p);
static int fl_create_thread(Fl_Thread& t, void *(*f) (void *), void* p) {
return pthread_create((pthread_t*)&t, &attr, f, p);
}
# elif defined(WIN32) && !defined(__WATCOMC__) // Use Windows threading...