procps/top/top_nls.h
Jim Warner 29f0a674a8 top: introduce background updates via separate threads
After the stage had been set in the previous patch, in
this patch we will actually implement those background
updates via 3 separate threads. The design was simple:

. the do-while loops have now been made truly infinite
. 2 semaphores per thread allow needed synchronization
. 1 semaphore will provide for each thread to sem_wait
. 1 semaphore will provide for display o/p to sem_wait
. and all 3 thread's program name was made descriptive

A complication was the potential for a signal directed
to one of our new threads. Rather than having a thread
try to deal with such signals, we pass a mask with all
signals blocked at pthread_create time. Thereafter any
subsequent signals are forwarded to the parent thread.

[ also sigprocmask was exchanged for pthread_sigmask ]
[ since warned about use "in multithreaded process". ]

[ plus we also modified each of those POSIX comments ]
[ about 2004 to agree with current signal-safety(7). ]

Sadly, after all this effort there were no performance
benefits to having separate threads. In fact there was
a measurable performance degradation when running with
ever smaller delay intervals. But even with a delay of
1/10 second the 'real' cost increase is only about 1%.

There is one way whereby any additional costs might be
eliminated (at least seemingly). One could introduce 2
separate sets of contexts for each of those 3 threads.
Then retrieval & display could be overlapped. However,
the resulting display wouldn't represent the real-time
results. Rather it would be stale by 1 delay interval.

Signed-off-by: Jim Warner <james.warner@comcast.net>
2021-09-20 20:05:44 +10:00

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/* top_nls.h - provide the basis for future nls translations */
/*
* Copyright (c) 2011-2021, by: James C. Warner
*
* This file may be used subject to the terms and conditions of the
* GNU Library General Public License Version 2, or any later version
* at your option, as published by the Free Software Foundation.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*/
/* For contributions to this program, the author wishes to thank:
* Craig Small, <csmall@small.dropbear.id.au>
* Sami Kerola, <kerolasa@iki.fi>
*/
#ifndef _Itop_nls
#define _Itop_nls
/*
* These are our string tables with the following contents:
* Head : column headings with varying size limits
* Desc : field descriptions not to exceed 20 screen positions
* Norm : regular text possibly also containing c-format specifiers
* Uniq : show_special specially formatted strings
*
* The latter table presents the greatest translation challenge !
*
* We go to the trouble of creating the nls string tables to achieve
* these objectives:
* + the overhead of repeated runtime calls to gettext()
* will be avoided
* + the order of the strings in the template (.pot) file
* can be completely controlled
* + none of the important translator only comments will
* clutter and obscure the main program
*/
extern const char *Head_nlstab[];
extern const char *Desc_nlstab[];
extern const char *Norm_nlstab[];
extern const char *Uniq_nlstab[];
/*
* Simple optional macros to ease table access.
* The N_txt and N_fmt macros are interchangeable but
* highlight the two types of strings found in Norm_nlstable.
*/
#define N_col(e) Head_nlstab[e]
#define N_fld(e) Desc_nlstab[e]
#define N_txt(e) Norm_nlstab[e]
#define N_fmt(e) Norm_nlstab[e]
#define N_unq(e) Uniq_nlstab[e]
/*
* These enums are the means to access two of our four tables.
* The Head_nlstab and Desc_nlstab are accessed with standard
* top pflag enums.
*
* The norm_nls enums carry a suffix distinguishing plain text
* from any text also containiing c-format specifiers.
*/
enum norm_nls {
AMT_exxabyte_txt, AMT_gigabyte_txt, AMT_kilobyte_txt, AMT_megabyte_txt,
AMT_petabyte_txt, AMT_terabyte_txt, BAD_delayint_fmt, BAD_integers_txt,
BAD_max_task_txt, BAD_memscale_fmt, BAD_mon_pids_fmt, BAD_niterate_fmt,
BAD_numfloat_txt, BAD_signalid_txt, BAD_username_txt, BAD_widtharg_fmt,
CHOOSE_group_txt, COLORS_nomap_txt, DELAY_badarg_txt, DELAY_change_fmt,
DELAY_secure_txt, DISABLED_cmd_txt, DISABLED_win_fmt, EXIT_signals_fmt,
FAIL_alloc_c_txt, FAIL_alloc_r_txt, FAIL_rc_open_fmt, FAIL_re_nice_fmt,
FAIL_signals_fmt, FAIL_tty_get_txt, FAIL_tty_set_fmt, FAIL_widecpu_txt,
FAIL_widepid_txt, FIND_no_find_fmt, FIND_no_next_txt, FOREST_modes_fmt,
FOREST_views_txt, GET_find_str_txt, GET_max_task_fmt, GET_nice_num_fmt,
GET_pid2kill_fmt, GET_pid2nice_fmt, GET_sigs_num_fmt, GET_user_ids_txt,
HELP_cmdline_fmt, IRIX_curmode_fmt, LIB_errorcpu_fmt, LIB_errormem_fmt,
LIB_errorpid_fmt, LIMIT_exceed_fmt, MISSING_args_fmt, NAME_windows_fmt,
NOT_onsecure_txt, NOT_smp_cpus_txt, NUMA_nodebad_txt, NUMA_nodeget_fmt,
NUMA_nodenam_fmt, NUMA_nodenot_txt, OFF_one_word_txt, ON_word_only_txt,
OSEL_casenot_txt, OSEL_caseyes_txt, OSEL_errdelm_fmt, OSEL_errdups_txt,
OSEL_errvalu_fmt, OSEL_prompts_fmt, OSEL_statlin_fmt, RC_bad_entry_fmt,
RC_bad_files_fmt, SCROLL_coord_fmt, SELECT_clash_txt, THREADS_show_fmt,
TIME_accumed_fmt, UNKNOWN_cmds_txt, UNKNOWN_opts_fmt, VERSION_opts_fmt,
WORD_abv_mem_txt, WORD_abv_swp_txt, WORD_allcpus_txt, WORD_another_txt,
WORD_eachcpu_fmt, WORD_exclude_txt, WORD_include_txt, WORD_noneone_txt,
WORD_process_txt, WORD_threads_txt, WRITE_rcfile_fmt, WRONG_switch_fmt,
XTRA_badflds_fmt, XTRA_fixwide_fmt, XTRA_modebad_txt, XTRA_size2up_txt,
XTRA_vforest_fmt, XTRA_warncfg_txt, XTRA_warnold_txt, XTRA_winsize_txt,
X_SEMAPHORES_fmt, X_THREADINGS_fmt,
#ifndef INSP_OFFDEMO
YINSP_demo01_txt, YINSP_demo02_txt, YINSP_demo03_txt, YINSP_deqfmt_txt,
YINSP_deqtyp_txt, YINSP_dstory_txt,
#endif
YINSP_failed_fmt, YINSP_noents_txt, YINSP_pidbad_fmt, YINSP_pidsee_fmt,
YINSP_status_fmt, YINSP_waitin_txt, YINSP_workin_txt,
norm_MAX
};
enum uniq_nls {
COLOR_custom_fmt, FIELD_header_fmt, KEYS_helpbas_fmt, KEYS_helpext_fmt,
MEMORY_line1_fmt, MEMORY_line2_fmt, STATE_lin2x6_fmt, STATE_lin2x7_fmt,
STATE_line_1_fmt, WINDOWS_help_fmt, YINSP_hdsels_fmt, YINSP_hdview_fmt,
uniq_MAX
};
void initialize_nls (void);
#endif /* _Itop_nls */