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The new 'Env::try_session' method mirrors the existing 'Env::session' without implicitly handling exceptions of the types 'Out_of_ram', 'Out_of_caps', 'Insufficient_ram_quota', and 'Insufficient_cap_quota'. It enables runtime environments like init to reflect those exceptions to their children instead of paying the costs of implicit session-quota upgrades out of the own pocket. By changing the 'Parent_service' to use 'try_session', this patch fixes a resource-exhaustion problem of init in Sculpt OS that occurred when the GPU multiplexer created a large batch of IO_MEM sessions, with each session requiring a second attempt with the session quota upgraded by 4 KiB. Issue #3767 |
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This directory contains ports of popular 3rd-party software to Genode. Usage ----- The tool './tool/ports/prepare_port' in the toplevel directory automates the task of downloading and preparing the library source codes. You can select individual packages that have to be prepared by specifying their base names (without the version number) as command-line argument. For example, the following command prepares both the C library and the Freetype library: ! ./tool/ports/prepare_port libc freetype To compile and link against 3rd-party libraries of the 'libports' repository, you have to include the repository into the build process by appending it to the 'REPOSITORIES' declaration of your '<build-dir>/etc/build.conf' file. Under the hood -------------- For each library, there is a file contained in the 'libports/ports/' subdirectory. The file is named after the library and contains the library-specific rules for downloading the source code and installing header files. How does 'libports' relate to the other repositories? ----------------------------------------------------- Most libraries hosted in the 'libports' repository expect a complete C library, which is provided with the 'libc' package. Please do not forget to prepare the libc package when using any of the other libports packages. The libc, in turn, depends on the 'os' repository for its back end. Because the 'os' repository is the home of the dynamic linker, libraries contained in 'libports' are safe to assume the presence of the dynamic linker and, thus, should be built as shared libraries.