Deadlock

  1. Preemptable resource :Resoource yang dapat dibersihkan dari proses yang menggunakannya tanpa efek yang buruk. Mudah diatasi dengan cara realokasi resource dari satu proses ke yang lainnya.
  1. Nonpreemptable resource: Resoource yang tidak dapat dibersihkan dari proses yang menggunakannya tanpa menyebabkan komputer fail.

Proses disebut deadlock, jika proses menunggu suatu kejadian tertentu yang tak akan pernah terjadi atau kondisi dimana 2 proses atau lebih tidak dapat meneruskan eksekusinya. Sekumpulan proses berkondisi deadlock, jika setiap proses yang ada dikumpulan itu menunggu sesuatu kejadian yang hanya dapat dilakukan proses lain yang juga berada di kumpulan itu. Proses menunggu kejadian yang tak akan pernah terjadi.

Deadlock terjadi ketika proses-proses mengakses secara ekslusif sumber daya. Semua deadlock yang terjadi melibatkan persaingan memperoleh sumber daya ekslusif oleh dua proses atau lebih. Adanya deadlock akan mengakibatkan sistem menjadi kacau.

Startvation terjadi ketika proses-proses menunggu alokasi sumberdaya sampai tak terhingga, karena bisa pada kebijaksanaan / strategi alokasi sumberdaya, sementara proses-proses lain dapat memperoleh alokasi sumberdaya.

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