09-08-2019
Multi threading in the UNIX environment is generally a kernel level process and there is no "multi threading" for commands in a script like you provide as an example.
However, you can "multi-processing" by running tasks in the background which you are already doing with the
& appended after the command and you can wait for completion of a background command with the
wait command.
Quote:
Multithreading is mainly found in multitasking operating systems. Multithreading is a widespread programming and execution model that allows multiple threads to exist within the context of one process. These threads share the process's resources, but are able to execute independently. The threaded programming model provides developers with a useful abstraction of concurrent execution. Multithreading can also be applied to one process to enable parallel execution on a multiprocessing system.
See, for example:
Thread (computing)
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LEARN ABOUT CENTOS
lh_node_usage_stats_bio
lh_stats(3) OpenSSL lh_stats(3)
NAME
lh_stats, lh_node_stats, lh_node_usage_stats, lh_stats_bio, lh_node_stats_bio, lh_node_usage_stats_bio - LHASH statistics
SYNOPSIS
#include <openssl/lhash.h>
void lh_stats(LHASH *table, FILE *out);
void lh_node_stats(LHASH *table, FILE *out);
void lh_node_usage_stats(LHASH *table, FILE *out);
void lh_stats_bio(LHASH *table, BIO *out);
void lh_node_stats_bio(LHASH *table, BIO *out);
void lh_node_usage_stats_bio(LHASH *table, BIO *out);
DESCRIPTION
The LHASH structure records statistics about most aspects of accessing the hash table. This is mostly a legacy of Eric Young writing this
library for the reasons of implementing what looked like a nice algorithm rather than for a particular software product.
lh_stats() prints out statistics on the size of the hash table, how many entries are in it, and the number and result of calls to the
routines in this library.
lh_node_stats() prints the number of entries for each 'bucket' in the hash table.
lh_node_usage_stats() prints out a short summary of the state of the hash table. It prints the 'load' and the 'actual load'. The load is
the average number of data items per 'bucket' in the hash table. The 'actual load' is the average number of items per 'bucket', but only
for buckets which contain entries. So the 'actual load' is the average number of searches that will need to find an item in the hash
table, while the 'load' is the average number that will be done to record a miss.
lh_stats_bio(), lh_node_stats_bio() and lh_node_usage_stats_bio() are the same as the above, except that the output goes to a BIO.
RETURN VALUES
These functions do not return values.
SEE ALSO
bio(3), lhash(3)
HISTORY
These functions are available in all versions of SSLeay and OpenSSL.
This manpage is derived from the SSLeay documentation.
1.0.1e 2013-02-11 lh_stats(3)