86 lines
7.2 KiB
Markdown
86 lines
7.2 KiB
Markdown
---
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title: "process.h"
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summary: "processes are the containers, in which threads are organized"
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---
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# `MAX_THREADS_PER_PROCESS` - macro
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The maximum amount of threads a process can have.
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This limitation is just for the bitmap,
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the overall processing structure would be capable of processes with unlimited threads, in theory.
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# `THREAD_ID_INVALID` - macro
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If [process_get_thread_id](https://nerdcult.net/projects/noxos/docs/codebase/proc/process.h/#process_get_thread_idprocess---function-int32_t) returns this, the process can't spawn one more thread.
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# `pid_t` - typedef
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A typedef for `uint32_t`, used for process identification.
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Such an identification number is also called `pid`.
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# `processes_standard_E` - enum
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These are standard pids
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- **None** - This pid is invalid, like `NULL` is an invalid pointer
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- **Kernel** - The kernels' main process
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# `process_blockers_E` - enum
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- **PIPE_OUT** - This blocker becomes activated, when the process tries to write to a pipe, but the pipe has not enough space for the data. It becomes deactivated, when the pipe has space to fit the rest of the data.
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- **PIPE_IN** - This blocker becomes activated, when the process tries to read from a pipe, but the pipe has not the requested amount of data. It becomes deactivated, when the pipe contains data again.
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# `process_T` - struct
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| Name | Type | Description |
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|-------------|---------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------|
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| name | char[128] | The processes' name |
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| id | pid_t | The process-identification number |
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| chunk | void* | A pointer to the chunk, where the process is stored in |
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| chunk_id | uint32_t | The processes id inside of its chunk |
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| page_map | [page_map_T](https://nerdcult.net/projects/noxos/docs/codebase/mm/page_map.h/#page_map_t---struct-page-aligned)* | The processes page map. |
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| executable | [elf_executable_T](https://nerdcult.net/projects/noxos/docs/codebase/drivers/elf/elf.h/#elf_executable_t---struct)* | The processes executable |
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| fd_array | file_descriptor_array_T* | Contains the open file descriptors of the process. |
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| stdout | pipe_T* | Pointer to the pipe, where **stdout** writes to. |
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| stdin | pipe_T | The pipe, where **stdin** reads from. |
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| stderr | pipe_T* | Pointer to the pipe, where **stderr** writes to. |
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| waiting | bitmap_T | A bitmap of process blockers. If this is greater 0 the process is blocked by something. |
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| num_threads | uint32_t | The amount of spawned threads, that belong to the process |
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| threads | void* | A pointer to the processes' first thread |
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| thread_ids | bitmap_T(reference needed) | This bitmap keeps track of the local thread ids the process has |
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| parent | [process_T](https://nerdcult.net/projects/noxos/docs/codebase/proc/process.h/#process_t---struct)* | The process, that spawned this process |
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| childs | [process_T](https://nerdcult.net/projects/noxos/docs/codebase/proc/process.h/#process_t---struct)* | A pointer to the processes' first child process |
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| prev | [process_T](https://nerdcult.net/projects/noxos/docs/codebase/proc/process.h/#process_t---struct)* | The previous process |
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| next | [process_T](https://nerdcult.net/projects/noxos/docs/codebase/proc/process.h/#process_t---struct)* | The next process |
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# `process_kernel_spawn(executable)` - function (void)
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Spawns the kernels' main process.
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**Warning:** this should only be called once, when initializing the scheduler!
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# `process_spawn(parent, name, executable, buffer)` - function (pid_t)
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Spawns a process named **_name_** as child of **_parent_** and returns its pid.
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The process gets its own page map with the mappings specified in **_executable_**.
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In order to apply these mappings, this function needs the **_buffer_** where the executable was loaded from.
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# `process_get_thread_id(process)` - function (int32_t)
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Searches for a free thread id in the process.
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If it finds one it returns it, else it returns [THREAD_ID_INVALID](https://nerdcult.net/projects/noxos/docs/codebase/proc/process.h/#thread_id_invalid---macro).
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# `process_clear_thread_id(process, id)` - function (void)
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Frees the thread **_id_** and makes it request-able again.
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# `process_pause_pid(pid)` - function (void)
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Resolves the pids process and performs `process_pause` on it.
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# `process_pause(process)` - function (void)
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Pauses **_process_** and all of its threads.
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# `process_start_pid(pid)` - function (void)
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Resolves the pids process and performs `process_start` on it.
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# `process_start(process)` - function (void)
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Starts **_process_** and all of its threads.
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# `process_kill_pid(pid)` - function (void)
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Resolves the pids process and performs `process_kill` on it.
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# `process_kill(process)` - function (void)
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Kills **_process_** and all of its threads and child processes.
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This will also destruct the `executable` and `page_map` associated with **_process_**.
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