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DATE 2021-08-01

HANGOUT

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Key: Value:

Key: Value:

MESSAGE
DATE 2021-08-25
FROM James Smith
SUBJECT Re: [Hangout - NYLXS] Sharing read/WRITE data between threads? [EXT]
The other problem with sharing writable data in "memory" is that it would not necessarily shared between multiple server instances. We run multiple mod_perl instances for reliability. Agree with other posters either use something like redis or memcache (possibly backed with a database).


-----Original Message-----
From: David Booth
Sent: 25 August 2021 00:51
To: modperl
Subject: Sharing read/WRITE data between threads? [EXT]

I am using Apache/2.4.41 (Ubuntu), with mod_perl. Apache uses multiple threads, and I want to share read/WRITE data between threads. (I.e., I want to be able to modify some shared data in one thread, such that other threads can see those changes.) In "Practical mod_perl" Stas Bekman describes how to share read-only data between threads, but says nothing about how to share WRITABLE data between threads.

Any clues about how this can be done? I've searched high and low and found nothing. I will also want to know what mechanisms are available to coordinate access to that shared data, such as locks or semaphores.

I also posted this message to StackOverflow, but got no response so far:
https://urldefense.proofpoint.com/v2/url?u=https-3A__stackoverflow.com_questions_68901260_how-2Dto-2Dshare-2Dread-2Dwrite-2Ddata-2Din-2Dmod-2Dperl-2Dapache2&d=DwICaQ&c=D7ByGjS34AllFgecYw0iC6Zq7qlm8uclZFI0SqQnqBo&r=oH2yp0ge1ecj4oDX0XM7vQ&m=qpyZVoG2Lx8wqNIB_pQ9wXQkohMh_5Q0HVZmgqmlSbs&s=oUnmv2w8aVNzfIni8nxA0CFh-xrZv1GS8jFquKbzsQM&e=

Any help would be appreciated!

Thanks,
David Booth



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  63. 2021-08-25 David Booth <david-at-dbooth.org> Re: [Hangout - NYLXS] Sharing read/WRITE data between threads? [EXT]
  64. 2021-08-25 Jacques Deguest <jack-at-deguest.jp> Re: [Hangout - NYLXS] Sharing read/WRITE data between threads?
  65. 2021-08-25 James Smith <js5-at-sanger.ac.uk> Re: [Hangout - NYLXS] Sharing read/WRITE data between threads? [EXT]
  66. 2021-08-25 Brad Van Sickle <bvs7085-at-gmail.com> Re: [Hangout - NYLXS] Sharing read/WRITE data between threads?
  67. 2021-08-24 David Booth <david-at-dbooth.org> Subject: [Hangout - NYLXS] Sharing read/WRITE data between threads?
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  69. 2021-08-11 Steve Hay <steve.m.hay-at-googlemail.com> Re: [Hangout - NYLXS] Problem compiling mod_perl on AIX
  70. 2021-08-10 Steve Hay <steve.m.hay-at-googlemail.com> Re: [Hangout - NYLXS] Problem compiling mod_perl on AIX
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  75. 2021-08-25 James Smith <js5-at-sanger.ac.uk> Re: [Hangout - NYLXS] Sharing read/WRITE data between threads? [EXT]
  76. 2021-08-25 David Booth <david-at-dbooth.org> Re: [Hangout - NYLXS] Sharing read/WRITE data between threads? [EXT]
  77. 2021-08-25 Jacques Deguest <jack-at-deguest.jp> Re: [Hangout - NYLXS] Sharing read/WRITE data between threads?
  78. 2021-08-25 Brad Van Sickle <bvs7085-at-gmail.com> Re: [Hangout - NYLXS] Sharing read/WRITE data between threads?
  79. 2021-08-24 David Booth <david-at-dbooth.org> Subject: [Hangout - NYLXS] Sharing read/WRITE data between threads?
  80. 2021-08-10 From: "Tammer, Rainer" <Rainer.Tammer-at-schulergroup.com> Re: [Hangout - NYLXS] Problem compiling mod_perl on AIX
  81. 2021-08-11 Steve Hay <steve.m.hay-at-googlemail.com> Re: [Hangout - NYLXS] Problem compiling mod_perl on AIX
  82. 2021-08-10 Steve Hay <steve.m.hay-at-googlemail.com> Re: [Hangout - NYLXS] Problem compiling mod_perl on AIX

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