Description Silenio Quarti 2001-10-11 14:22:48 EDT

On Linux RedHat 7.0 , if you call XInitThreads and link with
pthread, the first Xp call will hang.

Here are the steps to reproduce it:

1) Compile the attached C code in a machine with XPrinting
installed.

2) Setup a X printing server by running the following as root:

	Xprt :1 &

3) Run the executable "test". It should print out "start" and then hang.

4) Comment the following line in the makefile

LIB_FLAGS += -lpthread

5) Recompile the tescase.

6) Run it again. It should not hang this time.


++++++++++++++++++++++++ makefile ++++++++++++++++++++++++++++++++
LIB_FLAGS = -L/usr/X11R6/lib -lXt -lX11 -lXp -lXext
OBJS = print_hang.o

# Comment this line and the test will not hang
LIB_FLAGS += -lpthread

all: $(OBJS)
	cc -o test $(OBJS) $(LIB_FLAGS)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

++++++++++++++++++++++++ print_hang.c +++++++++++++++++++++++++++++
#include <X11/Intrinsic.h>

#define PRINTER_NAME ":1"

int main(int argc, char **argv) {
  XtAppContext xPrinterContext;
  Display *xPrinter;
  short major, minor;
  
  printf("start\n");
  XInitThreads();
  XtToolkitThreadInitialize();
  XtToolkitInitialize();

  xPrinterContext = XtCreateApplicationContext();
  xPrinter = XtOpenDisplay(xPrinterContext, PRINTER_NAME, NULL, NULL,  NULL, 0,  &argc, argv);
  if (xPrinter != NULL) {
    XpQueryVersion(xPrinter, &major, &minor);
    printf("XpExtension %d.%d\n", major, minor);
  } else {
    printf("Failed to open printer\n");
  }

  XtDestroyApplicationContext(xPrinterContext);
  printf("end\n");
}
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

NOTES: