From: Rob Meades <Rob.Meades@u-blox.com>
To: "newlib@sourceware.org" <newlib@sourceware.org>
Subject: Implementing a heap watermark
Date: Sun, 8 Nov 2020 17:14:05 +0000 [thread overview]
Message-ID: <sig.1581dd2f6c.CWXP265MB0039727CFB485A2881FCE9ADBEEB0@CWXP265MB0039.GBRP265.PROD.OUTLOOK.COM> (raw)
I run/test my library code on various embedded processors (STM32F4, NRF52/53, ESP32), all of which use newlib.
I need to implement a "minimum heap ever available" watermark kind of function so that, after my tests are run, I can be sure that I have left sufficient room for user code to obtain heap memory.
Such a facility does not seem to be available in newlib out of the box: does anyone have any recommendations on how to go about implementing such a function?
For instance, is the newlib malloc()ater guaranteed to only call sbrk() when it really needs more memory, as opposed to when it might have free blocks available but it is "cheaper" to call sbrk() then to allocate from those blocks? If the former then simply monitoring sbrk() would do the job for me. If the latter then I probably have to intercept the malloc()/free() calls to track what's going on.
Rob
next reply other threads:[~2020-11-08 17:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-08 17:14 Rob Meades [this message]
2020-11-09 14:08 ` Federico Terraneo
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