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Full Discussion: C Brain Teaser
Top Forums Programming C Brain Teaser Post 302116922 by Perderabo on Wednesday 9th of May 2007 09:22:19 AM
Old 05-09-2007
Astounding that that works, vino! Looking at the Linux man page for unlink(2), I see that it does not detect "text busy". Compare that to the HP-UX man page for unlink(2). The Linux unlink(2) is rather permissive. If that man page is right, it even allows unlinking an active mount point! I'm not sure what effect that would have... Posix does not require that unlink(2) disallow unlinking mount points (but the text in the standard makes it clear that this is because Posix does not ever mention mount points). But unlinking an active program is another matter. On one hand, the Posix Standard says:
Quote:
The unlink() function shall fail and shall not unlink the file if:
...
[ETXTBSY] The entry to be unlinked is the last link to a pure procedure (shared text) file that is being executed.
That sounds to me like an OS is required to disallow the operation. But toward the end of the page we have:
Quote:
The [ETXTBSY] optional error condition is added.
This leaves me confused as to whether or not the operation is allowed by Posix. But it will not work on most implementations of Unix. I would be interested if this program works with any kernel other than Linux.

A more portable solution would be have the program to write a little shell script to unlink the file and then exec that shell script.
 

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FANN_CASCADETRAIN_ON_DATA(3)						 1					      FANN_CASCADETRAIN_ON_DATA(3)

fann_cascadetrain_on_data - Trains on an entire dataset, for a period of time using the Cascade2 training algorithm

SYNOPSIS
bool fann_cascadetrain_on_data (resource $ann, resource $data, int $max_neurons, int $neurons_between_reports, float $desired_error) DESCRIPTION
The cascade output change fraction is a number between 0 and 1 determining how large a fraction the fann_get_MSE(3) value should change within fann_get_cascade_output_stagnation_epochs(3) during training of the output connections, in order for the training not to stagnate. If the training stagnates, the training of the output connections will be ended and new candidates will be prepared. This training uses the parameters set using the fann_set_cascade_..., but it also uses another training algorithm as it's internal train- ing algorithm. This algorithm can be set to either FANN_TRAIN_RPROP or FANN_TRAIN_QUICKPROP by fann_set_training_algorithm(3), and the parameters set for these training algorithms will also affect the cascade training. PARAMETERS
o $ann -Neural network resource. o $data -Neural network training data resource. o $max_neurons - The maximum number of neurons to be added to neural network. o $neurons_between_reports - The number of neurons between printing a status report. A value of zero means no reports should be printed. o $desired_error - The desired fann_get_MSE(3) or fann_get_bit_fail(3), depending on which stop function is chosen by fann_set_train_stop_func- tion(3) RETURN VALUES
Returns TRUE on success, or FALSE otherwise. SEE ALSO
fann_train_on_data(3), fann_cascadetrain_on_file(3). PHP Documentation Group FANN_CASCADETRAIN_ON_DATA(3)
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