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Full Discussion: pipe read and write with many forked children
Top Forums Programming pipe read and write with many forked children Post 61796 by steveneliuk on Tuesday 8th of February 2005 06:24:26 PM
Old 02-08-2005
pipe read and write with many forked children
I know how to read and write if i have a forked process with only one child. However what is involved with reading and writing with many forked processes. Say one parent that forks 5 children, and needs to communicate with all 5 in half duplex.

int temp[2], counter=0;

do{
pipe(temp);

if(fork()>0){
//store values of temp in a 2 dimensional array then re-index the array @ counter.
}
counter++
}while(counter<5);


Then if i access each the 2 dimensional array at location array[0][1] i cold write to child 1, and read child 1 at array[0][0];

Is there an easier way?

Im gong to implement this shortly, please let me know if im on the right track.

thanks for your time,

New to unix and c/
 

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LEARN ABOUT DEBIAN

glgetactiveatomiccounterbufferiv

GLGETACTIVEATOMICCOU(3G)					  [FIXME: manual]					  GLGETACTIVEATOMICCOU(3G)

NAME

       glGetActiveAtomicCounterBufferiv - retrieve information about the set of active atomic counter buffers for a program

C SPECIFICATION

       void glGetActiveAtomicCounterBufferiv(Gluint program, GLuint bufferIndex, GLenum pname, GLint *params);

PARAMETERS

       program
	   The name of a program object from which to retrieve information.

       bufferIndex
	   Specifies index of an active atomic counter buffer.

       pname
	   Specifies which parameter of the atomic counter buffer to retrieve.

       params
	   Specifies the address of a variable into which to write the retrieved information.

DESCRIPTION

       glGetActiveAtomicCounterBufferiv retrieves information about the set of active atomic counter buffers for a program object.  program is the
       name of a program object for which the command glLinkProgram() has been issued in the past. It is not necessary for program to have been
       linked successfully. The link may have failed because the number of active atomic counters exceeded the limits.

       bufferIndex specifies the index of an active atomic counter buffer and must be in the range zero to the value of
       GL_ACTIVE_ATOMIC_COUNTER_BUFFERS minus one. The value of GL_ACTIVE_ATOMIC_COUNTER_BUFFERS for program indicates the number of active atomic
       counter buffer and can be queried with glGetProgram().

       If no error occurs, the parameter(s) specified by pname are returned in params. If an error is generated, the contents of params are not
       modified.

       If pname is GL_ATOMIC_COUNTER_BUFFER_BINDING, then the index of the counter buffer binding point associated with the active atomic counter
       buffer bufferIndex for program is returned.

       If pname is GL_ATOMIC_COUNTER_BUFFER_DATA_SIZE, then the implementation-dependent minimum total buffer object size, in baseic machine
       units, required to hold all active atomic counters in the atomic counter binding point identified by bufferIndex is returned.

       If pname is GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTERS, then the number of active atomic counters for the atomic counter buffer
       identified by bufferIndex is returned.

       If pname is GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTER_INDICES, then a list of the active atomic counter indices for the atomic counter
       buffer identified by bufferIndex is returned. The number of elements that will be written into params is the value of
       GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTERS for bufferIndex.

       If pname is GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_VERTEX_SHADER, GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_TESS_CONTROL_SHADER,
       GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_TESS_EVALUATION_SHADER, GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_GEOMETRY_SHADER, or
       GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_FRAGMENT_SHADER, then a boolean value indicating whether the atomic counter buffer identified by
       bufferIndex is referenced by the vertex, tessellation control, tessellation evaluation, geometry or fragment processing stages of program,
       respectively, is returned.

NOTES

       glGetActiveAtomicCounterBufferiv is available only if the GL version is 4.2 or higher.

ERRORS

       GL_INVALID_VALUE is generated if program is not the name of a program object for which glLinkProgram() has been called in the past.

       GL_INVALID_VALUE is generated if bufferIndex is greater than or equal to the value of GL_ACTIVE_ATOMIC_COUNTER_BUFFERS for program.

       GL_INVALID_ENUM is generated if pname is not one of the accepted tokens.

SEE ALSO

       glGetProgram(), glGetActiveSubroutineUniform(), glGetActiveSubroutineUniformName(), glGetUniformLocation()

COPYRIGHT

       Copyright (C) 2011 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication
       License, v 1.0, 8 June 1999.  http://opencontent.org/openpub/.

[FIXME: source] 						    05/30/2012						  GLGETACTIVEATOMICCOU(3G)
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