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kubo39kubo39
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Merge pull request #10 from kubo39/eventfd
Add eventfd example
2 parents 21877f5 + 71e4649 commit 1efbe1a

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‎eventfd/CMakeLists.txt

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# SPDX-License-Identifier: Apache-2.0
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cmake_minimum_required(VERSION 3.20.0)
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find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
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project(ldc_eventfd_example)
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target_sources(app PRIVATE src/main.c)
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if(${ARCH} STREQUAL "posix" OR ${ARCH} STREQUAL "x86")
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set(ldc_target i686-unknown-none-newlibeabi)
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elseif(CONFIG_CPU_CORTEX_M)
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if(CONFIG_CPU_CORTEX_M3)
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set(ldc_target thumbv7em-unknown-none-newlibeabi)
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else()
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message(FATAL_ERROR "Unknown Cortex-M target")
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endif()
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elseif(CONFIG_RISCV)
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if(CONFIG_RISCV_ISA_RV32I)
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set(ldc_target riscv32-unknown-newlib-elf)
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else()
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message(FATAL_ERROR "Unsupported riscv ISA")
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endif()
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else()
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message(FATAL_ERROR "ARCH ${ARCH} not supported")
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endif()
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include(ExternalProject)
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set(ldc_src_dir ${CMAKE_CURRENT_SOURCE_DIR})
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ExternalProject_Add(
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ldc_project
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PREFIX ${CMAKE_CURRENT_BINARY_DIR}
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SOURCE_DIR ${ldc_src_dir}
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BUILD_IN_SOURCE 1
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BUILD_ALWAYS 1
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CONFIGURE_COMMAND ""
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BUILD_COMMAND
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dub
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build
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-f
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-b release
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--compiler=ldc2
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--arch=${ldc_target}
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INSTALL_COMMAND ""
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BUILD_BYPRODUCTS ${ldc_src_dir}/lib/libeventfd_example.a
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)
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add_library(ldc_lib STATIC IMPORTED GLOBAL)
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add_dependencies(
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ldc_lib
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ldc_project
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)
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set_target_properties(ldc_lib PROPERTIES IMPORTED_LOCATION ${ldc_src_dir}/lib/libeventfd_example.a)
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target_link_libraries(app PUBLIC ldc_lib)

‎eventfd/dub.sdl

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name "eventfd_example"
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authors "Hiroki Noda"
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license "BSL-1.0"
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targetType "staticLibrary"
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targetPath "lib"
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targetName "eventfd_example"
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dependency "zephyr-core" path="../zephyr-core"

‎eventfd/ldc2.conf

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default:
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{
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switches = [
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"-Os",
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"--betterC",
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"--float-abi=soft",
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"--relocation-model=static",
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"--defaultlib="
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];
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post-switches = [
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"-I%%ldcbinarypath%%/../import",
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];
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lib-dirs = [];
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}

‎eventfd/prj.conf

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# General config
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CONFIG_NEWLIB_LIBC=y
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CONFIG_POSIX_API=y
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CONFIG_LINKER_ORPHAN_SECTION_PLACE=y
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CONFIG_EVENTFD=y
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# eventfd() implementation currently depends on some networking APIs,
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# so provide reasonable defaults so it can be built.
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CONFIG_NETWORKING=y
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CONFIG_NET_TEST=y
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CONFIG_TEST_RANDOM_GENERATOR=y

‎eventfd/sample.yaml

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sample:
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description: eventfd example
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name: eventfd
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common:
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build_only: true
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platform_allow:
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- qemu_cortex_m3
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tests:
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app.default: {}

‎eventfd/src/app.d

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import zephyr.core.sys.posix.unistd;
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import zephyr.core.sys.posix.sys.types;
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import zephyr.core.sys.zephyr.sys.eventfd;
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import zephyr.core.stdc.stdio;
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import zephyr.core.stdc.stdlib;
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extern(C):
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@nogc:
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nothrow:
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noreturn fatal(string msg)
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{
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perror(msg.ptr);
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exit(EXIT_FAILURE);
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}
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/* As Zephyr doesn't provide command-line args, emulate them. */
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__gshared string[] input_argv = ["argv0", "1", "2", "3", "4"];
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__gshared int efd;
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__gshared int g_argc;
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__gshared string[] g_argv;
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void writer()
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{
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foreach (j; 1 .. g_argc)
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{
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printf("Writing %s to efd\n", g_argv[j].ptr);
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ulong u = strtoull(g_argv[j].ptr, null, 10);
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ssize_t s = write(efd, &u, ulong.sizeof);
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if (s != ulong.sizeof)
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{
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fatal("write");
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}
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}
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printf("Complete write loop\n");
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}
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void reader()
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{
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sleep(1);
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ulong u;
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printf("About to read\n");
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ssize_t s = read(efd, &u, ulong.sizeof);
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if (s != ulong.sizeof)
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{
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fatal("read");
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}
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printf("Read %llu (0x%llx) from efd\n",
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cast(ulong)u, cast(ulong)u);
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}
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int d_main()
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{
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auto argv = input_argv;
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auto argc = argv.length;
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if (argc < 2)
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{
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printf("Usage: %s <num>...\n", argv[0].ptr);
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exit(EXIT_FAILURE);
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}
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g_argc = argc;
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g_argv = argv;
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efd = eventfd(0, 0);
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if (efd == -1)
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{
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fatal("eventfd");
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}
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writer();
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reader();
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printf("Finished!\n");
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return 0;
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}

‎eventfd/src/main.c

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extern int d_main();
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int main() {
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return d_main();
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}

‎zephyr-core/source/zephyr/core/stdc/stdlib.d

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nothrow:
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@nogc:
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enum EXIT_SUCCESS = 0;
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enum EXIT_FAILURE = 1;
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noreturn exit(int status);
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void* malloc(size_t size);
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void free(void* ptr);
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ulong strtoull(const char* nptr, char** endptr, int base);

‎zephyr-core/source/zephyr/core/sys/posix/sys/types.d

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alias time_t = long;
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alias suseconds_t = long;
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alias ssize_t = long;

‎zephyr-core/source/zephyr/core/sys/posix/unistd.d

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module zephyr.core.sys.posix.unistd;
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import zephyr.core.sys.posix.sys.types;
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extern (C):
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nothrow:
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@nogc:
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uint sleep(uint);
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ssize_t read(int, void*, size_t);
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ssize_t write(int, const scope void*, size_t);

‎zephyr-core/source/zephyr/core/sys/zephyr/sys/eventfd.d

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module zephyr.core.sys.zephyr.sys.eventfd;
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extern(C):
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nothrow:
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@nogc:
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enum EFD_SEMAPHORE = 2;
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enum EFD_NONBLOCK = 0x4000;
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alias eventfd_t = ulong;
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int eventfd(uint initval, int flags);
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int eventfd_read(int fd, eventfd_t *value);
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int eventfd_write(int fd, eventfd_t value);

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