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djon
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POSIX
- Portable operating system industry standards
- standard for operating systems
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Deadlock
something cannot move because something is in its way
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_system()
passes command to the command interpreter which executes the string as an OS command
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_execl()
what is it and how many args?
- Loads and executes new child processes
- 1st - exe filename
- 2nd - same as the first becoming argv[0]
- 3rd - same as first becoming argv[1]
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_spawnl()
create and exe a new processs
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createProcess()
- creates a new process and its primary thread.
- the new process runs in the security context of the calling process.
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terminateProcess()
how many args and what are they?
- terminates the specified process and all of its threads
- hProcess[in] - the handle to the process to be terminated
- uExitCode[in] - the exit code to be used by the process and threads terminated as a result of this call
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WaitForSingleObject()
- waits until the specified object is in the signaled state or the time-out interval elapses
- If this handle is closed while the wait is still pending , the function's beaviour is undefined
- DWORD
- WINAPI
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WaitForMultipleObjects()
waits until 1 or all of the objects are in the singled state or the time-out interval elapses
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sleep(5000)
- suspends the exe of the current thread until the time-out interval elapses
- 5 seconds
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What is an OS
- To manage the resources
- allows all resources to access the hardware the same way
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Real time OS
Example?
- multi-user, multi-tasking, embedded
- Unix
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beginthreadex
- use if you are using c++ and launching thread
- must use reinterpret_cast<handle>()
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Program
- List of instructions that perform a task
- Word = Application software -stuff we use
- Windows = System software - stuff the computer uses
- Backups = Utility software
- Havoc = Middleware -software that isn't used by itself
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Process
- Program being executed
- Code that is running
- Requires processor
- Requirements for run
- Memory, state, call stack
- needs at least 1 thread
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Thread
- inside a process
- one of many paths of execution
- one machine only
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what is do threads share?
- global memory
- static variables
- heap(new)
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what don't threads share?
- stack - local variables, function params
- HANDLE/IO
- CPU state
- exception
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