Manual: new section for warnings and extended documentation for warning 57

This commit introduce an atfork hook in the runtime, as a follow up to the issue encountered in MPR ocaml#455 and MPR ocaml#471.

To handle all the specific fork scenarios allowed in Multicore, a hook is required in order to let specific "alterations"
to the runtime do their job: by default, on a single domain program, only the domain lock needs to be reset.
When systhreads are in use, more cleaning up duty is required.

As a result, the usage of pthreads_atfork is also removed, opting to rely in both case on manually calling the
runtime hook when required.

This commit introduce an atfork hook in the runtime, as a follow up to the issue encountered in MPR ocaml#455 and MPR ocaml#471.

To handle all the specific fork scenarios allowed in Multicore, a hook is required in order to let specific "alterations"
to the runtime do their job: by default, on a single domain program, only the domain lock needs to be reset.
When systhreads are in use, more cleaning up duty is required.

As a result, the usage of pthreads_atfork is also removed, opting to rely in both case on manually calling the
runtime hook when required.

64235a3 flambda-backend: Change Float.nan from sNaN to qNaN (ocaml#466)
14a8e27 flambda-backend: Track GC work for all managed bigarray allocations (upstream 11022) (ocaml#569)
c3cda96 flambda-backend: Add two new methods to targetint for dwarf (ocaml#560)
e6f1fed flambda-backend: Handle arithmetic overflow in select_addr (ocaml#570)
dab7209 flambda-backend: Add Target_system to ocaml/utils (ocaml#542)
82d5044 flambda-backend: Enhance numbers.ml with more primitive types (ocaml#544)
216be99 flambda-backend: Fix flambda_o3 and flambda_oclassic attributes (ocaml#536)
4b56e07 flambda-backend: Test naked pointer root handling (ocaml#550)
40d69ce flambda-backend: Stop local function optimisation from moving code into function bodies; opaque_identity fixes for class compilation (ocaml#537)
f08ae58 flambda-backend: Implemented inlining history and use it inside inlining reports (ocaml#365)
ac496bf flambda-backend: Disable the local keyword in typing (ocaml#540)
7d46712 flambda-backend: Bugfix for Typedtree generation of arrow types (ocaml#539)
61a7b47 flambda-backend: Insert missing page table check in roots_nat.c (ocaml#541)
323bd36 flambda-backend: Compiler error when -disable-all-extensions and -extension are used (ocaml#534)
d8956b0 flambda-backend: Persistent environment and reproducibility (ocaml#533)
4a0c89f flambda-backend: Revert "Revert bswap PRs (480 and 482)" (ocaml#506)
7803705 flambda-backend: Cause a C warning when CAMLreturn is missing in C stubs. (ocaml#376)
6199db5 flambda-backend: Improve unboxing during cmm for Flambda (ocaml#295)
96b9e1b flambda-backend: Print diagnostics at runtime for Invalid (ocaml#530)
42ab88e flambda-backend: Disable bytecode compilers in ocamltest (ocaml#504)
58c72d5 flambda-backend: Backport ocaml#10595 from upstream/trunk (ocaml#471)
1010539 flambda-backend: Use C++ name mangling convention (ocaml#483)
81881bb flambda-backend: Local allocation test no longer relies on lifting (ocaml#525)
f5c4719 flambda-backend: Fix an assertion in Closure that breaks probes (ocaml#505)
c2cf2b2 flambda-backend: Add some missing command line arguments to ocamlnat (ocaml#499)

git-subtree-dir: ocaml
git-subtree-split: 64235a3

This commit introduce an atfork hook in the runtime, as a follow up to the issue encountered in MPR ocaml#455 and MPR ocaml#471.

As a result, the usage of pthreads_atfork is also removed, opting to rely in both case on manually calling the runtime hook when required.  This way, fork() calls from C code no longer reset the OCaml thread machinery.  This should help with issues such as ocaml#12636.

(cherry picked from commit c6d00ee)
(and adapted to 4.14)

Co-authored-by: [email protected]

This commit introduce an atfork hook in the runtime, as a follow up to the issue encountered in MPR ocaml#455 and MPR ocaml#471.

As a result, the usage of pthreads_atfork is also removed, opting to rely in both case on manually calling the runtime hook when required.  This way, fork() calls from C code no longer reset the OCaml thread machinery.  This should help with issues such as ocaml#12636.

(cherry picked from commit c6d00ee)
(and adapted to 4.14)

Co-authored-by: [email protected]

* Remove unused images

* Add a script to detect unused images

* Remove unused function

* Do not remove `vendor/ood` on distclean

* Update images sizes in Applications

* Improve books layout

Switch from `lazy_t` to `Lazy.t`

Guidance at https://v2.ocaml.org/api/Lazy.html says:

> Note: lazy_t is the built-in type constructor used by the compiler for the lazy keyword. You should not use it directly. Always use Lazy.t instead.

This commit introduce an atfork hook in the runtime, as a follow up to the issue encountered in MPR ocaml#455 and MPR ocaml#471.

As a result, the usage of pthreads_atfork is also removed, opting to rely in both case on manually calling the runtime hook when required.  This way, fork() calls from C code no longer reset the OCaml thread machinery.  This should help with issues such as ocaml#12636.

(cherry picked from commit c6d00ee)
(and adapted to 4.14)

Co-authored-by: [email protected]